Need advice

I'm 30 my husband is 54 we have a 3yr old son together.

Lately my husband has been pushing me away when I try to cuddle up to him. When I try to cuddle up to him he tells me to get off him and get back on my side of the bed. I try to love in him like giving him a hug and I get the same response get off me. He has also been making comments about my body size and when I get upset and cry about how he's treating me he says its nothing to cry about its the truth. He acts like having sex with me is a chore that he doesn't want to do but does it anyways to shut me up which I have heard him tell someone.

Idk what to do. Give him space and not get near him for awhile and see if it changes anything or simply ask him if there is someone else he wants .

I also know that if we do split up he will not let me see my son and I really don't want to loose my son.

Thank you for your time and advice.