A poster, Spicer2000 (who went to high school with JM), said that JM asked a girl to prom and she turned him down. And Spicer said JM cried. My assumption from that is that JM did not have a girlfriend at least at the time of prom. Him crying has always stuck with me. I truly believe, and not just based on that one comment, that JM had major insecurities and never "got the girl", and that this resentment built up and contributed to his aggression towards women starting in college. No idea though if he had other girlfriends in high school. My personal opinion is that he did not, based on this story and others that he was kind of bumbling around the girls. Good question around any girlfriends in college...
I didn't put much weight in what Spicer had to say, just sounded disingenuous to me, and here to pretty much defend him, and somewhat misleading on facts that had already been established about him.