Well - you are not doing yourself any favours at all. You will continue to fool yourself because you are also "needy" yourself. and your standards have obviously been lowered.
I know it sounds cliche but get thyself to a counselor. Find out why you are picking up tramps and willing to accept someone which such obviously low standards. As I mentioned before - look where her other 2 boys are. There is a reason they are not living with her. UNFIT MOTHER might be the term.
There are so many wonderful women out there who you would enjoy a healthy, loving relationship with who you might miss out on - partially due to the fact you might end up with any one of NUMEROUS stds (not just aids - think Herpes, genital warts other stds).
I think you need to value yourself more than this and find out why you feel that this is who you need to be with.
