Don't know what to do anymore.

My husband and I got married in March of last year, since then things have gone to crap. He completely changed. He works, yes. And o tell him​I appreciate him. However, he isn't very involved with our children, he yells cusses and throws little boy fits constantly. He has no respect for me. It's like all he ever wants is sex, and not to have any responsibility. I'm exhausted I have a 3 year old a 1 year old, and I'm 6 months pregnant. I don't think I'm out of line for asking him to take care of the kids for a little while I just sit down, or ask him to clean up after himself. I really need advice because I'm over this completely.