Relationship question.. stuck between two amazing guys.?

(This is going to be a long one). Awhile ago I was with this guy.. we'll call him bob. Bob and I had always kind of had a thing but never did anything about it until then, and it only lasted a very short time then he left for college and nothing really happened after that. Then I got involved with another guy named.. Jim. Jim and I were just getting together when I saw Bob again for the 1st time since things ended with us and I still had a lot of feelings for Bob. So Bob and I hung out and we kissed, while I was with Jim. I never told him until about 4 months into our relationship and he asked out it and I told him the truth. This ended our relationship (let me remind you that Jim also cheated on me once too). So I spent the next 5 or 6 months being depressed and trying to win back Jim and nothing was seeming to work.. we'd be together off and on and it was killing me. So finally the semester ended and Bob came back to town. We ran into each other and started hanging out again and things were going pretty good but I kept getting held back because I still had feelings for Jim. Jim and I still talked everyday and it was hard to start something with Bob since Jim was always around. So as time went on I discovered that Jim still loved me and that Bob had been waiting to me to be done with Jim so that he could finally have his chance and he too loved me. Bob has issues along with Jim and basically I was the only good thing in either one of their lives. Now I have to pick from the two of them.. One that has always been there for me(Bob) and one that I have a past relationship with (Jim) and i'm really stuck and I don't know what to do.. Any advice would be awesome I know this is long and probably confusing, I'm sorry.