I have a boyfriend..but i dont know if im over my ex..?

Ok..I have been dating this guy for about 2 months now and we had dated before in school and it just didn't work out..but now I am in love with him..and I would do anything for him..but there is one problem..my ex..now my ex and i have a 15 month old son..he was my first love..my first ual experience and we dated steadily for 2 1/2 years..it ended very badly and was his choice..i wanted us to work it out but we didnt..now he has a girlfriend and i have a boyfriend and i have the baby..i do love my current boyfriend but i have a hard time thinking about what i would do if my ex wanted me back..i mean he has been a complete jerk to me and hasnt helped a whole lot with the baby..it's just i have all these mixed emotions about him...how do i know if i am over him..and how can i ure myself that i wont let him back into my life?? PLEASE i just need some advice...