should we just be friends?

Bianca • Typical.
Okay so about a year ago I started talking to this guy who graduated from my high school the year before. Well anyways we just talked and became friends but I started developing feelings for him and apparently he did too but when I suggested we should do something about it he said he would never take a relationship with me seriously so we decided to stay friends. Well fastforward a few months later I started dating again but we were still talking and when I asked if it made him uncomfortable he said no because after all we weren't in a relationship. So I continued dating and I slept with this guy but I felt so guilty I felt like I cheated on him so I decided to tell him. About a month ago he decided to let it go and try to make this relationship work because I was slowly gaining his trust again , or so I thought until just recently he broke up with me saying he really never felt the same after I slept with the other guy. ( I know I messed up bad) but he said he was sorry he faked wanting me back he just needed to know if it would work . Well I was hurt but he was always a better friend than boyfriend so I was like let's stay friends and he was like thanks yeah I'd like that but a couple days ago he asked me to take him back because he really does love me but the thing is I'm afraid he's just lonely right now and he might just be going through a phase because he tends to change his mind all the time but I still love him. Someone help please.