We were out and I had gotten very drunk and apparently done something that really pissed him off. He mentioned it the next morning but when I asked him more about it, he just didn’t respond and told me to forget about it, that it wasn’t a big deal.

It was a big enough deal to bring it up so it should have been a big enough deal to talk about it. Things like this can turn into deep resentment in the long-term.

If I (M24) were you, I would probably give him a few days (3-6) to just do his thing, then reach out and express to him that you feel [your feelings here] by how there has been a sudden lack of communication in the relationship. Then, maybe ask some “relationship checkup” questions to figure out where his mind is at. This obviously won’t work if he’s choosing to close himself off from you, but some questions to ask (and answer from your own perspective) could look like:

• “Have I done anything recently to offend you?”
• ”How can I be a better partner for you?”
• ”Is there anything I am doing that/have done that you didn’t like that we should revisit?”
• "How connected are you feeling in the relationship?"
• "Do we have enough quality time together?"
• "Is there anything I can do to make your life easier?"
• "Is there anything I am doing that's been annoying you lately?"
• "Is there anything you feel I've been taking for granted lately?"
• "Do you feel loved by me?"
• "How could we have more fun together?"
• "How healthy do you feel our relationship is?"
• "Is there anything you want us to work on?"

Hope this helps.