Is his behavior suspicious?

My boyfriend and I have been together for a couple of months. I asked for vacations this next 2 weeks to visit my family since we already have a national holiday this Monday and I get an extra day of vacation. My boyfriend also went to visit his family but only for the weekend. The thing is, yesterday he told me out of nowhere that he was at the beach with a couple of friends since it was his brothers birthday and it was a last minute decision. It felt weird because he didn't tell me he was even planning on going to the beach, he only told me he was already at the beach. I tried to not get angry and told him to enjoy himself. I went to bed before him and told him to have fun, good night, I love you blabla (at around 11 pm), but I woke up the next day and there was still no reply at all (8 am). I waited thinking maybe he fell asleep after drinking at the airbnb with his friends, but then he texted back at like 10 am saying he fell asleep after coming back from the bar/karaoke. I dont know if im in the wrong for being mad about him not communicating his plans with me. The thing is when I go out he always asks me to communicate everything and I do it because I know it brings him peace to know how im doing, where im going, when i get home safe etc, but when he goes out he doesn't do it, he doesn't even tell me he is going to the beach with hos friends until he is already there. I feel like i dont get the same treatment and it feels weird. When I go out he gets all anxious and he is always texting me, but when he goes out he doesn’t even text me until the next day. Am I in the wrong?
Is his behavior suspicious?
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