Am i completely beyond help?

I'm a 31 yr old guy, when i was 26 i was engaged to a long term gf (known since school) & she died suddenly. Since then I have not had any sort of meaningful relationship, every girl i've liked has given me the same "just not in that way" or "just want to be friends". I have had sexual relationships, but they tend to be with girls already in relationships (i know...i know!) who see me as a bit of fun or whatever. I have tried counselling/anti-depressants etc but nothing is making me feel any better about my life as it is, i'm starting to feel as if im completely repulsive to the opposite sex & have lost all confidence in myself. I know this isn't the worst situation on here, but any advice is appreciated :)