
I want to apologize for the delayed response. Let me welcome you here to the bpdfamily, and wish for you as much help and support as I have received. It's clear you have a lot in common with many of us here, and this is a community where we help each other, so I'm sure if you keep posting and reading you will find it helpful.
I can relate to what you describe that lead you to your affair, I went through almost the same process and reached out to another woman for support, validation, and an emotional connection that was missing in my relationship. Like you, I wanted to feel again. It's happened to many of us around here.
It is possible to rebuild the trust that has been broken in your relationship. Doing so takes time, but it can be done.
Who decided to separate? Do you have steady, regular communication? What's the current status of things?
I know your life is difficult now, but knowledge will help you make the right decisions. Please read the articles and workshops - they will give you some good skills at communicating.
Keep posting - it is very therapeutic, and you will be greeted by so many people with circumstanced similar to your own. You will be amazed. Take care of yourself.