Should I leave him or I should work on my feelings to see what I have?

I was dating a guy that said he was in love with me, always fixing things around my place always doing everything to make me feel special treating me like a princess...flowers on my doorstep the works i told him straight up my feelings weren't there for him even though he had so many qualities i would have loved in a man....(had it been someone else that i WAS interested in) i suggested friendship but he insisted we could work on it and see if i developed the "love". After 4 months of his giving and caring i still wasn't feeling anything and started to feel smothered I also felt like this was starting to hold me back from dating someone i could have been interested in....i had to tell him on more occasions then one that i couldn't "see" someone that i just wasn't interested in...it isn't fair for him..or for me, this took several goes to get it through, as his mind was quite set, after i made it as clear as i could that i wasn't falling for him and i couldn't do this he became possessive and almost stalkerish to an extent ...just not being able to "let go" the only thing left for me to do was i had to be very blunt and firm and not give him any rope or he would just hold on and hold on, friendship just wasn't working, my last words to him were not pleasant.... but i think if someone loves you...they'll let you go...so you can be happy and find what YOU are looking for......