Why I keep drraming about a man that was never my boyfriend but we dated, while being in a relationship?

I keep having these weird dreams about that guy. Such as we are back together, or that he is apologising for lost connection and regretting the fact that we aren’t together. I used to go on dates with him before I met my boyfriend. So it was pretty much 2,5 years ago. I don’t even know how it ended because we weren’t a couple, and there wasn’t any kind of closure. These dreams makes me very uncomfortable because I am in relationship.

At the moment my current relationship is having some difficulties. And I noticed that when we are fighting, these dreams keep popping in my head. Then I wake up and just can’t understand what’s going on. It’s getting annoying.
Why I keep drraming about a man that was never my boyfriend but we dated, while being in a relationship?
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