Disappointed

So my boyfriend is taking another girl to go see a romantic movie the day I come back from my trip. Never asked me about this and tells like me he didn’t care. It really disappoints me very much and makes me feel less important. Plus it’s dirty dancing and I love the movie dirty dancing. What do I do? I trust him because I know he never would cheat but my friends are telling me he shouldn’t do something like that. I told him how I feel about it but I feel like he won’t care. I’ll give everyone an update about this if anything happens.