Problem in my relationship

Hiya my name is lorraine and im 23yrs old and i have an amazing boyfriend for the past year who loves me and would do anything for me. but right before i got with my boyfriend evan, i just came out of a 4 year relationship that was really bad but i loved my ex colin to death. My problem is i still love my ex colin and i dont think i love my boyfriend evan at all. i keep trying to love him as he is the best and treats me really great. im also afraid to brake up with him as im afraid i will go back to my ex colin. also i dont have any friends and i have no1 to talk to.. At the moment i feel trapped i feel like evan is the type of guy to marry and im not finished being young and having fun, also im afraid that if i do brake up with evan that i will never find someone who treats me this good and i dont want to end up with someone who i might not love. i know when i was with my ex colin that i loved him so much and i would do anything for him but i dont feel the same way about evan. please please help me

Have you had any responses as yet? I'm am 25 and in the exact same position. I don't want to break up with my boyfriend because he is amazing but I can't love him properly and I'm getting stressed. I don't know what to do. Any advice that you've received yet?