Drove past his house…?

I don’t know why I’m so obsessed with driving past my ex house. Last night when I got out of work at 11:30pm, on my way home I saw a silver car (not his car) pulling out of his driveway. I’m upset because it’s late at night and wondered who could that be… I don’t want him to replace me with someone else, but I guess that’s what I’m afraid of.
Drove past his house…?
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