Disappointed significant other

Any ladies have advice on a not-so-thrilled significant other? I am engaged to the love of my life. He has two daughters from two different women. (14yo and 4yo) I just found out I'm pregnant a few weeks ago and he just doesn't want it. We had the A talk and he agreed to keep the baby. I just feel like he said that because that's what I wanted to hear. I feel so robbed of the joy and happiness that pregnancy is as this is my first because he's already been through this twice and it's nothing new to him. I don't even want to have sex with him anymore I feel so distant from him. I fear that if we are having a girl he'll resent it even more. It sucks because abortion isn't something I believe I could do and I've already told everyone. Any advice? Do they eventually come around? All I want to do is cry.