Why my guy friend girlfriend always want to hangout with me in midnight not in day time?

My friend do job n get tired so he sleep early and she knows I'm fuckboy n yes we had sexual past not now. Yes we went few times in midnight clubs we just did make outs n she told me keep it secret. Why she doing this? Lol.
Why my guy friend girlfriend always want to hangout with me in midnight not in day time?
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