Should I confront him once and for all?

I am really angry at my older (37) boyfriend of 3 years, cause I really don’t know if I can take his word or not anymore, he told me that I can go to his apartment in the city and stay over the weekend, in fact, he has said it many times, the weekends that I have traveled to see him which are just a few, I go for a day (saturday) and then he brings me back thats same day and he insists for me to stay over but I never have, cause he studies here in the town that I live so when he comes here we see each other, and I did not feel the need to go and see him on the weekends (since he already came here from Monday to Friday) So this past friday I said to myself ‘i’m going to take his word and text him to stay over this weekend’.

So I texted him this past friday at 5:46pm and told him: ‘Hey hun, I want to go over tomorrow and stay over this weekend, Are you doing something? and he replied super late at 8:35 pm just saying ”i’m coming next week’. Honestly I got so mad I did not reply back anything, So I don’t understand why would he would not give me an explanation? it’s the weekend, plus I have not gone to his place for a super long time, I get he is a super messy and his house looks like a hot mess but this is not new to me!!, but to me this is a red flag!! I have to think he has another woman/gf over there, or back in hometown or something is going on, his graduation is also coming at the end of this month, and he has some things going on. I dont want to let my guards down, convincing myself that perhaps nothing is wrong.

So what do you recommend me to do?