My friends dont like him, what should I do?

I’ve been going out with my boyfriend for 5 years now, and weve broken up so many times I cant even remember them all…hes cheated on me a bunch of times, but then again so have I…were both madly in love with each other, nut my friends dont think hes good for me…a few months ago, we split up and said that we wouldnt hook up with anyone so that wed figure out what to do about our relationship…he called me a few times during that time and said that he loved me and missed me and I told him that I still needed a little more time to figure things out…when I went by his house a few days later to tell him that I also loved him and missed him, and that we should get back together, I walked in on him and my best friend, as well as another girl…so I left him, and decided that that was the end of it, ofcourse he called me a bunch of times to apologize, and gave me roses countless times…all of which I threw in his face before slaming the door on his face…shortly after that, he left town for school, but now hes back…and I really do love him, but I cant go through all that we went through again…all my girlfriends say that I shouldnt be with him, and that id be an idiot to go back to that again…I really dont know what to do…I know that deep down he loves me too, but I dont know if thats enough, cause I know that hell cheat again…what should I do?