Am I overreacting?

I’ve been talking to this guy since the beginning of the year. Before the pandemic, we went on a handful of dates and I went over a few times to his place but we never actually had sex. He also started school, has work, has a young kid, and is back with his parents while looking for a new place. About 3 weeks ago he told me he really wished he could be at home with me and I asked him if he really meant that because sometimes I don’t know. He told me he knows he’s been distant and that he’s sorry. That he has a lot on his plate and he doesn’t want to disappoint me or let me down because he can’t give me what I want right now. I told him that I like talking to him and I don’t want to stop, but I didn’t expect anything from him now (as in a relationship) bc everything going on. He told me he likes talking to me too and he never meant he wanted to stop. After that we continued to talk as normal every day. Last week he started texting me more and even saying he wanted to see when he could come over to my place this week. Ive also been sending him sexy pics and videos the past week and he loved them. I even hinted that I don’t send these pics to anyone else, as in like I don’t talk to anyone else (but didn’t say that part). And he replied saying good that he’s glad I don’t. This made me extremely happy. It was all good until yesterday when he barely texted me all day. I texted him over an hour ago today and nothing. But I know he had no sleep last night and had an early test this morning. I noticed last night he followed a girl on Instagram, but my mind is going crazy and overthinking about that. How can he go from saying he’s glad I’m not sending pics to other guys and texting me all the time and all to nothing a few days later? I know he’s busy but its just killing me because I thought things were getting better. Am I just overthinking this all? What do I do?