I am currently in a 5 month relationship but having an affair with my ex, he is also with his new girlfriend. We both want to be together but for some reason, everytime I feel like leaving my boyfriend for him I start having doubts. He is also telling me that he has left this other person but I deeply know that he hasn´t, I do not know what to do, my boyfriend really loves me and me and my ex, have really tried to not contact each other but we simply can´t. I also feel jealous when I know that he can be with his girlfriend. The other day I was with my ex and my boyfriend called me, and my ex grabbed my phone and answered him, telling him that I was with him, that I was going to leave him. That broke my bf´s heart but I convinced him not to leave me. I didnt talk with my ex for a day, but I started talking to him again the very next day.
I know I sound like a really bad person but Im just totally confused. What should I do?