I was in a long distance relationship for two years with a guy who told me he loved me and always talked about a future together. We were both Christians/virgins and wanted to wait till marriage to have sex with each other. He broke up with me last summer, and had sex with another girl, who he claimed to be "in love with" only a few weeks after. She ended up leaving him for her ex soon after. When my ex told me all this, I took some space away from him to deal with it, but now he's back after telling me how sorry he is. We talk every day, he tells me that he loves me and needs me and wants to get back together at some point when I'm ready. In my head, all I can think about is him and some girl (I haven't asked what her name is... I don't know if I should) in bed together. Now I'm at an impasse because I do love him, but every time I think about my feelings for him, my head can't get past the fact that so quickly after he got out of a 2 year relationship... he just went off with some random girl. I keep feeling jealous, angry, hurt, and it feels like it will never go away. Do you think I should continue being friends with him and feeling this way? Or ask him about the details of what happened because maybe that'll make me feel better? I just don't know what to do.

I take it you know you cannot trust him but yet you still are trying to trust him... you should probably get back together with your ex under the stipulation that the rest of the world dies and it is up to you 2 to repopulate the earth.

This is your choice to make and only your choice. However you have to accept that he was not with you and was free to do as he chose and he did. He didn't do anything to you and might not have thought that there was a possibility that you two would be back together. I doubt if the details of his tryst would make you feel better. So choose - either forget about the other girl and work on your relationship with him or move on.