Writing to an inmate - why?

Well, my girl and I are officially broken up as of yesterday. There were many things that lead to this break up, but a big one was the fact that for the last 6 months, she has been writing letters, behind my back, to a felon. She does not know this person - she found him through a Prison Pen Pals website. I have seen some of the letters and she has told this man that she "loves him" and "can't wait to meet him" when he gets out of prison in about 5 months. She completely hid this from me - I had a feeling that something was going on and did some snooping, which was how I found the letters. We ended up breaking it off and then she came back several times. By 'came back', I mean that she would call me and invite herself to my place for the night. I should have told her no, but I missed her and I was thinking with the wrong head. She told me that she would consider getting back together with me only if I went to therapy, and that she would go, too. I thought this was a good sign so I made the appointment. She wanted me to go first, by myself, and I did. I came home that evening after my appointment and found her kissing another man in a bar. She claimed that she was attracted to him but that they had never been sexual. I came to find out that was a lie the same way I found out about the prison pen pal. One night while she was sleeping in my bed, I went through her text messages and found several from this guy that were sexually explicit and referred to things they had done together - the day of my therapy appointment! So, basically she was stringing me along while she went out and looked for another guy - which was something that she claimed to have no interest in doing. She just did not want to be in a relationship at the moment - or so she said. I had a big row with her the other day and called her out on her selfishness and callous disregard for my feelings - and her lies. She told me that I had no reason to be angry and that she was not sorry because a) I knew about the prison pen pal for a couple months before we broke up and I didn't leave then and b) We are no longer a couple so she feels no need to tell me what she is doing. I don't know what happened to this girl, but she was never like this - until about 6 months ago when the strange behaviors started. I know that I deserve better and I should write her off, but I still miss her. (And does anyone have an idea what would possess someone to have a romance with a complete stranger who is in jail? Talk about a blow to my ego.)

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