What do I do if I’m mad at my boyfriend but it’s not the right time to talk about it?

My boyfriend has been staying out late at bars and places with drinking. He was invited out by a woman I've never met from his old job and he hasn't mentioned who else is there. I never get invited to any of these things. It's almost 3AM and I've barely heard from him. He knows this bothers me. That's the quick background of why I'm upset.

He just sent me a text after a few hours of silence, casually asking how I'm doing. I don't want to ignore him but I don't want to argue because he's with people. If I text dry then he will notice and I'll ruin his fun. But I can't pretend to be happy about something that makes me very upset. Any advice on how to handle these feelings and this situation in the moment?

What do I do if I’m mad at my boyfriend but it’s not the right time to talk about it?
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