Most Helpful Guy
Don't do that to yourself (put yourself down/sell yourself short) and don't do that to him (assume he doesn't like you just the way you are). Why don't you deserve to be treated well? The fact is that you do deserve to be treated well.
Most Helpful Girl
I think you should let him decide whether you are enough for him or not. Maybe he doesn't want another girl but you. There's no use in telling him because if he doesn't want you then he will make that decision for himself. There's no point in making him leave you if you like him