I dated this guy for about five months and it was my first serious relationship that involved sexual activity. We broke up because he "wasn't ready for a serious relationship." We didn't speak all summer, and when I got back to campus, he called me and apologized for acting immature. He still isn't ready for a serious relationship, but he asked me if we could still date. I told him that it was okay, but that I didn't want a sexual relationship. We both agreed that we could date other people because we don't want anything serious.
I went to a party a week later, and met this really great guy who apparently is in the same frat as my ex. I would like to get to know him, but my friends keep telling me not to pursue ANYTHING with him because it will ruin the friendship between frat brothers. I don't think it's fair! Also, my ex has been leaving messages on my phone/email more frequently. He calls like we are just good friends, but I wonder if he wants me now because his friend likes me. I have feelings for my ex, but I want to put them on the back burner while I date other people. How do I still stay friends with him and start up something with his fraternity brother without tearing the two of them apart?