I am working on changing my habits, because I too feel like this more often than not when my partner goes out without me. One thing that has helped me out (which is much easier said than done, I admit) is to think of your own behaviour when you go out and potentially get drunk with friends. When I go out without my partner, I mostly have fun with platonic friends and catch up, and end up thinking of him at the end of the night 99% of the time. If your relationship is solid, there is reciprocal trust, and he feels the same way you do, chances are he is behaving the exact same way.

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I will say it's very challenging to get into this mindset (my anxiety makes me spiral and think of worst case scenarios), but if you put in the work, it will help your relationship in the long run. Don't be too hard on yourself - this is is super common. Keep treating your anxiety and trying not to spiral, and don't be afraid to communicate your feelings to your boyfriend.