How should I react when my boyfriend cancelled our Valentine's plans to party with his friends?

Meticulousmegan
My boyfriend and I have been dating for over a year and 7 months, so I would conisider up somewhat serious. As of the current moment, he is living with me. He couldn't afford to do anything on Valentine's Day like he promised this year, so he rescheduled our Valentine's Day date to last night. The problem with that is that he chose to hang out with his work friends (who he sees every day), and bailed on me at 11pm via a text, "you need to chill. Go to bed." That was the last text he sent that night. He's currently with his friends that he parties with a lot, and it really affects my self-confidence when he bails on important dates like this without any explanation. I feel like he never prioritizes our most important plans, and it is hurting me. He never came home tonight. It just makes me wonder if he enjoys partying and doing drugs more than he prioritizes important dates with me. How should I react to this? He does this more often than I'd like to admit; he doesn't even tell me that he can't do the date tonight, he just stops texting me. He doesn't ever tell me what they're doing, and extremely rarely answers any of my messages. He's blaming me, due to the fact that he "needs space sometimes." I find this pretty funny, due to the fact that he works every day 7am-6pm, and I go to school full time 7am-2pm and work a part time job 3pm-8pm. I typically give him a lot of space, especially when I'm at work. Is this me overreacting, or is this a personal issue of his that he should work out? If so, how do I bring it up in conversation without it seeming like I'm attacking him?
How should I react when my boyfriend cancelled our Valentine's plans to party with his friends?
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