relationships

I'm normally not the one to post but I need some advice. I have two boys ages 10 and 2 I'm pregnant with my third child. my 10 year old is with a previous relationship. my first child the pregnancy was great. I got a lot of support from my 10 yr old father . this pregnancy I get no support. my boyfriend don't wanna have a baby. he's been unfaithful in the past and hr sneak and lie alot. there's a want who claim that he's the father of her baby. a baby that was before me. he wants that baby but don't want to my unborn child. I'm so stressed. I feel like I don't even wanna have his baby. I'm already 14 weeks. I had a miscarriage in March and he was no help. what should I do. I didn't wanna be pregnant but I want my baby. why I'm I feeling like just ending it.