Cheating maybe??

So last night my boyfriend went out until almost 11 at night and won’t tell me what he did, he usually does. Well he gets home and goes straight to bed, no good night or I love you or anything so I’m like alright. I tried to go to bed and tried to cuddle him and he wouldn’t let me he kept telling me to just leave him alone. I currently use his phone to log into my Facebook because I need some WiFi to update mine but we don’t have WiFi at the moment and I get on to get on mine to find out he changed his password so whenever I get done on mine I can’t log back into his. This morning for work he just gets up and is like alright I’m leaving, doesn’t give me a kiss like he usually does and then I go back to sleep and wake up to a text from him and he’s saying thank you for not getting too mad at me last night for coming home late. I’m confused by all of this and he is my first real boyfriend and my longest relationship. I’m not sure if those are signs of seeing or talking to someone else 😕