She asked my friend out first!

My best friend and I recently got into an argument, and he ended up saying that my girlfriend had asked him out before dating me. I thought he was lying to hurt me but, when I confronted her, she admitted that it was true. She says she still has feelings for him but is with me because she likes me more. I don’t know if I can believe her, and this has been causing some tension between us. My friend and I have resolved our differences and are speaking again, but I haven’t been able to sort out my issue with my girlfriend and am thinking of ending our relationship. It feels as if the whole thing is a lie, based on convenience, and I don’t feel good about it at all. What should I do? Should I accept her word and try making this work, and just end it and move on? My friend feels guilty, but there’s nothing I can do about the change in how I feel about my girlfriend.
You have to try and accept what she says based upon how the two of you interact, not on how she used to feel about your friend. If you can forgive your friend for what he said, your reasons for doubting your girlfriend shouldn’t hold much weight. There are reasons why she is with you, and you are presumably with her because you feel a certain way about her. As adults, you both have the option of putting this awkwardness behind you and focus on what you have, along with what you can do to strengthen your bond. The two of you alone have the power to make that decision. Go with how you feel about each other at the moment, based on how well you know each other now, not by what you felt in the past.

I want to end a relationship but am afraid of his anger. What should I do?
If this relationship is based on fear, it is already doomed.