My relationship of 3 years is finial at the end

I don't understand why do men tent to take advantage of you while your pregnant I been stress out thur my whole pregnancy I just can't wait until my son comes I'll feel much happier and better about thing one thing for sure we will definitely be co parents I always wanted a family but hey things didn't work out that way I just couldn't take the being out all the time partying hanging with friends texting and calling girls lying to me and all not spending time with me always making plans with me and than last min just switching it I'm just so fed up