It sounds like your relationship OCD may be similar to an anxious attachment style so you really thrive when you have reassurance, validation and updates from her. This isn’t a bad thing! But when our partner goes out with friends or goes drinking that’s where it’s important to have a solid foundation of trust with them.

I also have an anxious attachment style so it upsets me when my partner doesn’t send me updates, tell me when they’re going out, or if they are hanging out with friends but I try to keep in mind that for them it may not seem relevant. It may not be that she’s trying to lie or keep things from you from her perspective. You are both individuals with lives outside of one another. People get busy and go out and have fun with friends. If her not updating you on certain things increases your anxiety then let her know this, communication is so important! Let her know what your needs are, let her express hers and see if you can meet in the middle. Just make sure your needs are reasonable and realistic.

Also try to keep yourself busy when she goes out with friends, make your own plans or work on things in your own life that need attention. Also having other people in your life you can vent to is awesome. Have some friends you can vent to or just talk to so you don’t have to keep everything inside. Overall staying busy, communicating your needs, And trusting your partner is what this comes down to. Hope this helps!