So a few days ago I saw my ex boyfriend on this dating site called meeteme. I accidentally clicked on his profile and saw him, dredging up old feelings. And then suddenly he messaged me wanting to talk about how I broke his heart when he and I broke up 3 years ago and he needed closure. So I complied and helped him with it and he told me how he now has trust issues. And I will admit I was 14 at the time (young and dumb) and now that I'm 17 I have changed my ways and I love him with all my heart. Buuuuttt he has a girlfriend that he really loves. Well at first we started talking formally, then if became more friendly, and then it became sexual and loving. We ended up sending a few pictures and we eventually ended up having sex after talking for 6 hours. He told me that he does love me but he can't break up with his girlfriend, and he asked me if I would keep us getting together a secret. I said I would because I don't want him to get angry with me. I really love him so much but I can't just simply try to break them up. What should I do???