He (25m, 24f) slept for 16+ hours.

Is this ok? Long story short , I’m person that looks past a lot of stuff but when I care about someone I care about them. So we haven’t been the best of partners, but I do my best and he does too, we had a huge argument ( been together about a year) and when they were driving home I noticed a girl text him( m 26,f24), I didn’t think anything of it because of their job and I didn’t want to assume anything or make the situation worse, but I just didn’t have a good gut feeling, so I got dropped off at home. And we texted but I had a bad feeling , so I wake up and do my normal good morning text( 747am) I gave them the benefit of the doubt sleeping in on a Sunday, 9 goes by 10,11,12,1pm,2,3 ( last time we texted was around 1045pm) they said no good morning/ afternoon text , just asking if I got my issued with my car fixed ( had car issues that morning) and that they slept for 16 hours. I look past a lot of stuff but I just feel hurt and dumb , I don’t mind being the end of a joke. I always wanted to make people laugh, I guess that’s the silver lining in all of this. Just need some advice am I overthinking yes or no ?