Please help my betta fish!?

A year ago, I bough a beautiful betta fish, Jessica. She was very active and healthy. A couple of weeks ago, she tried to make a move on me! I tried to make her stop because I was already in a relationship, but she wouldn't. Last week, I got really drunk and I think Jessica and I did the dirty! My girlfriend found out and dumped me and I don't know if it is right to start a relationship with Jessica. I want to, but should I?