Not feeling loved.

I'm not feeling very loved since I've started trying to conceive with my partner.. I think he's just giving up. I've gained weight .. Lots of weight here recently I think it might b a factor in our relationship. I've lost my job due to company decisions to downsize production. I'm feeling worthless and stressed. Not to mention he looks at other girls and I'm right next to him he even acts out when he drives past them or standing in a grocery line. He's 45 years old and acts like a child when a pretty girl walks by. It makes me feel like I will never be good enough to him.. I wanna call it quits when he acts childish. But I can't seem to do it we have a son together. Should I just quit trying to have intercourse with the child.