Help need advice please??

My boyfriend always wants to do what he wants and even when it comes to movies it's always what he wants to watch. I just told him how I feel and he says all you do is bitch all the time. I'm getting bored and depressed because of it I feel like its all about him all the time. And I can't stop crying. We also have a 4 year old boy and a little girl on the way. I never pictured my relationship to be this way. Half of me says to stay and deal with it and the other half tells me to leave and live my life. I can't talk to him anymore I feel like he stopped caring about what I want and how I feel. I feel so alone. What should I do???