awoel88, I am so sorry you find yourself in this position, but I'm glad you found SI - it's a great place to get the support and information you need for this journey.
My advice to you would be to read the information in the Healing Library, especially the BS FAQ - there is lots of useful info there.
How do you move on?? Advice needed!
It takes time! I hated it when people told me that at the beginning, I wanted a quick fix - my life back! But the fact is that it takes on average 2 to 5 years to get over this sort of betrayal and it seems to me that most of us are on the 5 year program.
Of course, what you do with that time also helps. Try to process what you are feeling, rather than pushing your feelings away - "you can't heal what you won't feel". Think things through, journal your thoughts and feelings, read here on SI and post when you feel the urge. Talk to your husband about what you are going through. Communication in a situation like ours is vital.
Has you husband gone to IC? Is he working out why he had the affair and how he allowed himself to betray both you and himself that way? A lot of the healing in my marriage is coming from the fact that my husband has taken full responsibility for what he did and is working very hard on his issues. Perhaps your husband should read "How to Help your Spouse Heal" if he hasn't already done so.
In this situation there are 3 separate entities: you, your husband and your marriage. All 3 need attention to heal from infidelity. You need to work on your healing, your husband needs to work on his "whys" and "hows" and you both need to work on the marriage. The healing of all 3 can't be rushed, it takes as long as it takes unfortunately.
I have felt more pain in the last 18 months than I thought it would be possible to endure, but I have also grown more as a person than I thought possible. Betrayal is inclined to shine a spotlight on all sorts of hidden issues and I have found that working through those issues (in my case Fear of Abandonment as well as Co-dependency were big factors) has really grown me as a person. I will come through this experience a better, stronger, more mature woman and for that I am so grateful. I wish it hadn't taken my husband's affair to get me to this point, but I am glad I have been forced to face my demons, if that makes sense?! What I am trying to say is that it helps if you look at this horrible situation as an opportunity for personal growth.
deep down I'm still left feeling so alone, insecure, hurt, and betrayed. I want our relationship to work, but I don't know how to get over this feeling.
^^ it takes time. It often feels like things will never get better, but somehow, with time, they do. It just takes a lot longer than you would imagine. At 18 months out, I have lots of good days now, but I STILL have the odd bad day/ bad couple of days.
Here are the links to two posts I did some time ago, about things I wish I had known at the start of my journey through betrayal:
Things I wish I had known Part 1: http://www.survivinginfidelity.com/forums.asp?tid=501667
Things I wish I had known Part 2: http://www.survivinginfidelity.com/forums.asp?tid=501705
Hang in there. Things will get better, I promise you that!