<human>: I broke up with my long-term girlfriend, let's call her Susan, about 2 months ago, and we haven't talked since. I e-mailed her recently to get some closure/wanted to reconnect our previous friendship, since we were close friends in the year before I asked her out.
This was her response e-mail.

"I haven't been responding to your messages because I needed the time and space. Out of respect for you and our prior relationship, there's something I have to say. I want you to know that this happened after we broke up, that this wasn't planned and I had no idea this would happen. John and I are in a relationship. I understand if you don't want to be friends or even on speaking terms."

John is a mutual friend, and was my neighbour last year. I was paranoid that Susan was cheating on me with John in the final month before we broke up. I was beating myself up about the break-up, but since that e-mail I remembered why I asked Susan out in the first place. I was bored and needed a girl who was willing to fuck and ready to cook me stuff. So I'm just curious. Should I really be surprised about the result of Susan and my relationship?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Was paranoid, ex got into a relationship with friend that I was suspicious she was cheating on me with. Paranoia now over since insecurity unfounded. Realized how shallow a bastard I am. Ok realization?