Confused and lonely

My husband has been running off with his buddies a lot, distancing himself from me and our son and we haven't had any sort of intimacy in over a month now. I know he's dealing with depression and tonight he admitted to me he's scared to have sex because he doesn't want another baby. But he's hardly taking to me or even wanting to participate in family events. I'm upset and frustrated, I need some kind of advice or encouragement because lastly I've felt like a single mother