Help please why do I feel this way?

back in late July and early to mid-August 2023, I was talking to this neurologist guy I met on Bumble. We really clicked, and he was super excited about starting something with me until we had a date scheduled at this art museum. On the day of the date, he sent me a long message saying he couldn't be in a relationship right now because of his residency and (neurology residecy) work. He assured me it wasn't about me, saying I was amazing and he didn't want me to wait for him to be ready. A couple months back in June 2024 I was doing DoorDash on the side and had to deliver to the apartment he lives in not his room but his apartment and it brought back some things. Fast forward to March 2025, and I still think about him, even though I've been in a relationship with my current partner for almost a year and a half. I even find myself checking the neurology page on Facebook to see what he's up to and how he looks now. How can I stop this obsession? Should I reach out to him? I used to not think about him much, but now it feels like I do all the time, and I feel bad about it.
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Is it possible this man still thinks of me as well
Help please why do I feel this way?
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