Limerence is driving me crazy

Ok before I start I’m very much aware on why I’m obsessed with this guy and it’s because of my childhood and growing up with little to no connection with people and limerence satisfies my need to want to be love or experience love. Story: I met this guy while I was working as a waitress he was with his uncle. I literally don’t know anything about this man . Not his name, nor his age just that he’s tall and French. I liked his smile and the jokes we were making. He tells me he wants to take on a date and wants my number. I said no because I had a boyfriend at the time and have regretted it ever since. Me and my bf were having issues and I knew the relationship wasn’t going to last long.but said no because I didn’t want to be a cheater but have regretted my decision ever since and have not stopped thinking about him and it’s been months. I’ve been thinking about that French men since I met him and created all these scenarios in my head on what our relationship would be like and how inlove We’d be. And how attractive I find him and how affectionate I would be towards him. I’ve never had this feeling towards I guy I’ve met. Logically I know I’m probably feeling like is because when I met him I was already vulnerable from my relationship. And I’m obsessing over this dude because I don’t know what could have happened. I know he could have been a bad person or an abuser or Narcissist but my brain just thinks about the nice things. I know to stop limerence just tell myself that you don’t know him and your creating a fabrication of someone that’s not true. My friend who still works there told me his uncle comes by the restaurant sometimes and I told Him next time to get his number.