Im a nice lad but i keep getting messed around by girls?

And i dont even deserve it.Its really hurting me,my mate treats them like crap and he's always got a girlfriend he cheats on his girlfreind and he's still got a girlfriend.I havent had one for 2 years,ive tried with 3 or 4 girls in that time but for some reason they want nothing to do with me and i be really nice and try and be funny i even bough a girl some flowers and i got rejected.I tried internet dating and nobodys interested on there either.Its as if they dont want me because im genuine or somthing