Should I be worried about my relationship?

Backstory- I’m 24, my boyfriend is 39. Yes it’s a large age gap but has worked just fine for us so far. I like older men, and feel that I act older than I am, and generally don’t like hanging around people my own age. We’ve been together for almost 3 years and have lived together (with his 10y/o son) for about 1.5 years.

We have not been having much sex lately. I had leg surgery awhile back and was unable to for months. Then when we finally did again, I got pregnant. A week after we found out, I was told I was having a chemical pregnancy and lost the baby at 5 weeks back in the end of October. It hit me hard but he didn’t seem to be very affected by it, but was very supportive of my feelings. Since that happened, we’ve only had sex 3 times, and not at all in the past couple weeks. All 3 of those times, I had to initiate it, he wouldn’t (and still hasn’t) tried to have sex with me at all since the miscarriage. We didn’t conceive on purpose, but discussed it after and unless he lied, we’re both fine (not actively trying though) with getting pregnant again. Last week I changed work schedules and have not been getting much sleep, so have not tried to initiate sex. But honestly, I’m tired of being the only one to initiate it, so I’ve been waiting for him to. When we went to bed last night, idk why, but he waited until I was already falling asleep to say ‘I want to make love to you’. He didn’t make a move. I think he thought I was already asleep, which I practically was, but I remember him saying it.

Today (we both have the day off work), he has been very clingy, constantly trying to kiss and hug me when I’m in the middle of cleaning or something. He knows I hate when people get really clingy. I never pushed him away or anything though, I stopped and kissed/hugged him back and told him multiple times that I love him. He’s now just on the couch watching tv acting totally dejected. Not really engaging in conversation or anything. I’ve asked if he’s ok, what’s wrong, etc. He says he’s fine. His favorite thing to do is play video games, I asked if he would game with me or if he wanted to go out for lunch, he said no thanks.

Lately I’ve been hanging out with my friends a bit more, still only 1-2x a week though. I’ve been drinking with them, because my boyfriend doesn’t drink and doesn’t really like to go out. I’ve been bored of sitting at home, so I go out with friends. I’ve checked with him before each time I go out, he says and acts like he’s completely fine with it. I still spend most of my time at home and haven’t cancelled on him or anything like that. Last week, I hung out with coworkers; 2 brothers, another male coworker, a few girls I didn’t know, plus multiple couples. I made sure several times that he was ok with it and he said he was. I’m thinking maybe that upset him, because I don’t know what else it could be.

He won’t talk about it but he’s acting strange. What should I do? Should I be worried? We’re usually very open and communicative of our feelings/thoughts, and always talk through any arguments or conflicts that come up.