Oh god. I really resonate with this. Just before I left my marriage, I met a guy. We had insane chemistry, deep connection and I felt loved and "seen" in a way I hadn't done for years in my marriage.
I thought about him all the time, every day, obsessively checking my phone and his social media. The irony was, I never actually met him in person - it was all on zoom as he was in another country. It was never even a proper relationship - I knew I wasn't ready for a new relationship as I needed to process everything from my marriage break up, but I'd never had such intense feelings for a guy before in my life.
I was talking to him for over a year and then he ended up messing me around. I was so heartbroken. Disproportionately! It felt like I was more upset about what had happened with him than the ending of my 20 year marriage. But actually I think the grief, and feelings of rejection and abandonment were all combined from both situations.
What helped me get over it was therapy (I had a therapist who specialises in attachment theory which is what I think I needed), journalling, being outside in nature. Something else I think really helped was spending time with people who I knew loved me and I felt safe with (friends and family). It was like my whole body and system was in a state of feeling either intense highs or lows, and I needed to get back to a state of equilibrium.
I also felt like I'd never meet anyone like this guy again, he was my "dream man", I'd never been more attracted to anyone - but its been 3 years since I met him and I can honestly say I don't feel that obsessive pull towards him like I did - I feel neutral and I'm pretty sure I wouldn't want to be with him now!
It's good you've recognised now it feels a bit of an unhealthy dynamic, rather than later down the line. As PPs have said, it might be that your feelings are so strong partly due to being vulnerable having recently divorced. It sounds like it's happened to a few of us. It's very hard when you're in it though!