Could I be ruining this relationship on purpose without knowing...

[almostthere]

About three weeks ago my bf's exwife stopped by to drop the kids off and i was over. This is nothing new we used to live together but moved out and each of us back to our parents homes to save money for a house. we do still manage to sleep together every night and have dinner together every night. She used to drop the kids off to us then too. But this time because weeks had passed since i wasnt around when she was there because of scheduling conflicts pretty much...she was really jealous. she cheated on him and divorced him to be with the other guy. he didnt want her after that though because he questioned he faithfulness and now she wants my bf back because the other guy doesnt want her. i have had to deal with this for 10 months. All the arguing between them about me and him being together. he would argue with her for sometimes half hour once every hour. i never understood why he couldnt just ignore the phone calls since he knew what she wanted and knew it wasnt about the kids. anyway...on this particular day she screamed and shouted through a closed door with me and my bf on the other side...im going to tell her. now i dont remember if it was i am going to tell her we slept together or just i am going to tell her. which i think makes a huge difference in the story. he called the cops on her after she came to our bedroom window banging on it screaming Me and him slept together. i wonder if he called the cops to shut her up about it or just because of how she was being. Since then i forgave him either for what he did or even what he didnt do. I really dont think he could of but we react differently to those we intended on loving forever. this i know from my own experiences. now we are 3 weeks from moving in together and I have been getting these images during sex of those two together intimately. Obviously i dont have an orgasm at those times because the thought hurts and sickens me. it has happened before we set a date too. usually i can just block it out but last night while we stopped at a local bar for a beer and 2 games of pool i didnt feel the same with him. I didnt see him the way i normally do. and while we were making love i got the image again. I want to tell him what is happening but i am not sure i should. i dont know what to do. i have never been convinced that he is over her. he never said anything about her but its just his actions. thats going to be another post though. one issue at a time.