Lost and confused

I'm stuck in a relationship that i almost can certainly say I'm over...I've been through a whole lot in the 10 years and these last two I've seen some side that I'm not sure if I want to stick around for.... To me there is no TRUST and how can you have a serious relationship without that as a key pointer???? Our son is almost 2 and yet I am still a single parent.......We don't live together which is why I guess he dont take his role seriously......he tells me he take care of him , but his out look on taking care of him is buy him things that I say he needs.... there is always a excuse of why he can't watch him or why he can't let him spend the night....I don't know what I should do.....Yes we fight on the subject and nothing seems to change.... can someone tell me if I should walk awayfrom the 10 years?? The way I'm feeling now is that I should fo because i can do bad by myself....this won't be the first time I've handled parenthood on my own but it is most definitely the last.... time