How can i get over him.?

i was with my ex for 2 years. we had a daughter together and another baby on the way. (im only about 6 weeks along) and he said he doesnt see us getting back together anytime soon. we just broke up yesterday and on Saturday we were just fine nothing was wrong. and after he talked to his mom... he changed so since saturday he started acting funny and completely ignoring me. and wednesday morning i got a note on my desk saying he wanted a break that he had to much on his mind and i never cleaned and he just isnt as happy anymore. but i let him do whatever he wants i would do whatever he asked, i never deprived him of sex, i always cleaned, but it was hard to do everything at once when i was taking care of our daughter and doing school work. i dont expect us to get back together. do you think he was cheating, or he just felt tied down.? i dont think a guy would ask a girl to marry him and then throw a 2 year relationship and kick his preggo fiance and kid out of his house over not cleaning.... and how do i get over him. for me it isnt easy i have his initals tattoo'd on my hip and everything i own is what we got together. and i have to talk and see him everyday because of our daughter. would it be wrong for me to hit him up for child support for our daughter and later for the new baby.?