I don't see a stop sign, but if you don't want to hear from Betrayed Spouses, let me know, and I will delete this.
Sadly, there is no one thing wayward can do to let their spouse know they love them and feel ashamed.
After a betrayal in which the faithful spouse was lied to, gaslighted, and likely discarded to some degree, while the wayward went off to have fun with the affair partner, words me nothing.
It's only actions that count going forward.
I do think telling him what you said here is very important, but it's more important to show it.
How? That's a difficult one.
Nothing says I don't love you more than having sex and fun and dating someone else while married to someone.
Even thinking of dating someone while married is incredibly insulting to the faithful spouse.
Once the damage is done, there really isn't any one thing that can be done to show love.
It's time and distance and consistency and honesty during that time, that will show love.
Alas, that can't be rushed and even with time, the betrayed will never trust the wayward the way they once did.
One thing that will help is that if you engaged in any blameshifiting or rewriting of marital history to justify the affair, you might want to apologize for doing that and acknowledge that it was a deep wound in yourself that lead to the affair.
After all, a faithful spouse can't fix something if they don't know it's broken.
If something in the marriage was broken, counseling was a good choice, and if that couldn't fix what was broken, separation or divorce would have been a kinder approach.