Is he cheating?

So my husband and I haven’t had sex since his birthday party which was 6/16/18 but before that we hadn’t done anything for weeks. Like maybe two or three weeks. That’s not normal for him to just not want to do anything. He has stopped trying to initiate sex all together. He says he doesn’t try on the weekdays because his schedule is 2:30pm to 11pm Monday-Friday and our baby doesn’t go to sleep until after I pick him up and she wakes up at 9:30 and doesn’t go back to sleep until about 3. But I asked him why he doesn’t on the weekend and he never gives me an answer. On the weekend we’re always together. Like seriously the only time we’re apart is when we’re in the bathroom. So I know he can’t be doing anything with anyone then. But he goes into work 30 minutes early and usually leaves about 10-30 minutes late every day. He doesn’t sexually touch me anymore unless I start it and even then he tells me every time that’s he’s just not really in the mood. When we were dating we use to have sex every time we saw each other and we both took turns starting it. Now that I’m pregnant again I don’t feel very attractive (especially since I’m measuring so big) so I need him to make me feel sexy. I just don’t get that from him anymore... what signs should I look out for? He’s cheating on girlfriends in the past but he promised me he was past that now. And since we’re married and he’s never done this before I thought he was being truthful....was I lied to?