I'm wary of using words like paranoia and delusions, as they are so so severe and indicate the person is in a state of psychosis -and no one knows this for sure. Sometimes people get very jealous, and this is precisely the form it takes, unfounded suspicions.
I don't know if this is an episode or plain old awful-to-feel jealousy. Therapy might help if this is an ongoing problem.
But meanwhile, maybe try and think of all of the reasons why she may not be having an affair, even making a list. Also, perhaps thinking of past instances when you felt this way, but it didn't end up being the case. It would be important to try to talk yourself out of this (at least to an extent) before you see her again, so that she doesn't get the brunt of it, it could really harm your relationship, as I'm sure you know.
If this doesn't only happen when she goes out like this, but seems instead to be part of a bigger picture of going down the rabbit hole of bipolar paranoid psychosis, then I would suggest you (also) get in touch with your psychiatrist about adjusting your medication.
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