Can anyone help please? Why do i always get rejected when I feel so close and in love?

I have had alot of rejections by women during my love life so far and decided not to ask out any more women until I was sure we wanted the same things. Im in my 20's and had my heart broken by a girl who was my best friend when i was in college for 2 years. I told her i loved her coz i did and she said she felt the same way, she was goin out with another guy but said we were soulmates and i believed her- i lost my virginity to her and was crazy in love, but she started making excuses to stay with the guy she told me d her and she hated, she eventually dumped me by text saying she wanted no more than friendship from me and never did. I was devastated and deletd her from my phone as i couldnt trust myself. Anyway a year later I met a girl who i got on really well with, she wasnt as stunningly attractive as my first love but we became great friends, she would always kiss me hello and goodbye(on the lips) and sit on my lap when we were together, we cuddled all the time. I was scared as i started to feel more for her and we got on great. I convinced myself she couldnt like me more than a friend- NO girl ever has. Even the one i thought was 'The One' before. We went to a party and stayed chatting together all night as we always did. The next day everyone asked me were we 'together' as a couple. I started to believe we could be then as others had seen how we were with each other and thought we could be. So i plucked up my courage (with a few drinks) and went in for a kiss- i told girls of feelings before and thought spontanious would be exciting. She kissed me back but said 'this is probably a bad idea' we ended up cuddling and she said 'we are such good friends it wouldnt work' I thought thats why it would work? The next day she said she didnt want a relationship at all at the moment. 2 weeks later she started going out with a guy from the football team. I was hurt and she still tryed to speak to me but i couldnt forgive her though i never told her. Whats wrong with me? I feel really lonely sometimes, this was a few years ago. I think its coz im a big guy im 40lbs overweight. But women who are more overweight than me have slim boyfriends. Is it coz a man shouldnt have curves, he should be muscley and a big woman looks well looked after by a good hunter gatherer. Im a nice guy but im wondering why lately- i dont meet girls anymore and im well into my 20's (27)and never had a relationship! My parents are worried about me, who will understand what ive been through!? I miss the friends ive had but feel used by them to. Help. I want to be atleast attracted a bit to a partner.