BW here. This may be harsh, but is not meant to be cruel.
Start with downloading How to Help Your Spouse Heal from Your Affair by Linda MacDonald. Read it today (it's short, like 100 pages). Put a copy of the successful rebuilders page (it's just a list) in your wallet, in your phone, in your car, everywhere. Read it EVERY DAY. Incorporate the list into your psyche.
Because you chose to continue the A, it seems to me there is a clear lack of empathy here (having an A shows lack of empathy - continuing the A after seeing a BS's devastation ratchets that up quite a bit in my book). Your words may sound nice, but they don't mean jack at this point (and I hope that if you look at the situation objectively, you will recognize that they shouldn't mean jack to anyone.... your BH gave you a GIFT of trying to work on things after dday, and not only did you not accept it with grace & humility, you abused him and his gift by continuing your A).
So. It seems to me that educating yourself about the TRAUMA that comes to a BS from an A is a much needed step on the path to finding some empathy (and I echo Chaos' post about how much of the selfish "I" is apparent). I would listen to the 2-part interview with Marnie Breecker on The Addicted Mind (there is a thread in General called something like "finally a therapist who gets it" which I will bump for you). This will be HARD to listen to (and just bc they talk about sex addicts and use the male pronouns for the WS does not - for one minute -mean that it doesn't apply to you or your BH).
I would also listen to the Helping Couples Heal podcasts (they are referenced in that "finally!" thread I will bump).
Get yourself in with a GOOD IC. A good IC will not blame the marriage or your BH for any of your choices (and that includes the subliminal blame that comes from exploring how the M made you "vulnerable" to an A - language that reeks of deflecting responsibility). A good IC will help you find the courage to become an honest person - not just with your BH, but in ALL things. Dishonesty and deceit are cornerstones of A behaviors.
Help your BH find a good IC too. Personally, I think someone that specializes in trauma is more important than specializing in infidelity. Most folks can find ways to educate themselves about infidelity (ideally on the relational betrayal model, which does not blame the BS for the WS choices, and does not re-traumatize the BS by suggesting they are codependent solely bc s/he is exhibiting signs of codependence post dday). If your BH is suicidal (and I was for at least a year - even after my own WH attempted suicide) this needs to happen ASAP.
Become the driver of your own healing bus. If you spilled milk, you would clean it up yourself... not wait for someone else to bring you a paper towel. This is no different (except spilling milk is a mistake.... an A is a deliberate choice). It is essential that the WS be proactive in their healing and in their support of the BS healing. You cannot fix him - he is broken in ways you cannot imagine, and (unfortunately) he can only heal himself. It ain't easy. If this is a difficult concept, it may help to imagine that you drove your car, drunk with ego kibble, into a brick wall... with your BH in the passenger seat. He's got myriad injuries, broken bones, etc. You cannot do the physical therapy for him... but you can support him through it all - the emotional equivalent of bringing him water, and ice packs, and driving him to the appointments, etc. Do NOT cower in your own shame and self victimization about the fact that you drive into the brick wall. That doesn't help anyone. Sure, you are also hurting from this. But (again) the difference is that you chose to engage in the hurtful behaviors.... he had zero choice in any of this.
Learn to let go of the outcome. IOW, do the work to fix the broken parts inside you bc it's what you need to do for you.... If you are only "doing the work" to try and save your M, most BS will smell it from a mile away.
Many of us don't understand how our WS can possibly think they want to be M, as having an A is the antithesis of wanting to stay married. A WS has shown by their actions that the BS and the M are expendable and we feel it deeply.
Try and find ways to be patient and understanding during your BH's "triggers". If you educate yourself on trauma, you will learn that our lizard brains go on overdrive, so when we say cruel things to our WS - esp in the first months- it comes from a place of abject pain and fear and all the things our lizard brains were designed to protect.
Do not minimize or become defensive. Instead, do what you can to validate the pain your BH is expressing. Even if your BH says things you find wrong, validate what they are feeling. There will be later times to explain how their perception differs from yours - the midst of a trigger (or flood or angry outburst) is not the time to quibble over who is "right". An easy example is a BS saying something like "I can't trust anyone because they are all liars". Rather than correcting them with "that's not true" or "only I am a liar", an empathetic response would be "I'm so sorry that my lies and living a secret sexual life has caused you to question the honor and trustworthiness of everything around you. I will do all that I can to become a person of honesty and integrity that deserves your trust".
Keep posting here. You can add a stop sign to prohibit BS from posting on your thread (this may be helpful if you feel BS's posts are cruel/hurtful.... sometimes we can let our anger take the reins and project our own hurt onto a WS's thread).
Buckle up and Godspeed. It's a pretty bumpy journey.