I keep dreaming that i'm cheating on my girlfriend with my 'first love', it scares me?

A little bit of context, although i used the phrase first love me and her (first love) never actually dated in any sense and she was actually a emotionally manipulative women. But i keep waking up feeling like shit, but also part of me feeling a little proud that

The dream is detailed enough where i know exactly who it is that i'm sleeping with, but it scares me when i wake up because i'm not sure (when i wake up) if the dream was fake because it felt so real

I keep dreaming that i'm cheating on my girlfriend with my 'first love', it scares me?
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