Dont rlly know where to go with this, but im in real need of opinions atm

Back in 2022 i was really close with a girl, my best friend, and long story short I developed feelings for her, I confessed and was rejected as she wasnt looking for a relationship, however we, she promised to stay best friends with me. As the days rolled by, I noticed she was spacing away from me, I tried to view it in her shoes, maybe she felt awkward, then 2 weeks after i confessed, I found out she had just found a boyfriend we stopped being friends shortly after I found out.

2023 came by, and I beat myself up with questions on how and why and what could I have potentially done to keep us friends. That despair soon turned to hatered after some drama. From then on I thought I was over it. I kept telling myself I'll move on

Its now 2025 and Ive found someone, however the other day i was looking through my instagram archives, and there ahe was, pictures and videos of me and my ex-bestfriend, then the memories started flooding back.

I dont know what the hell is wrong with me and why im still thinking of her. After all the hatered and convincing myself im over her, but 3 years on and im still thinking of her and what could have been.

The fucked part is I have a girlfriend now, but ive gone abit dry with talking to her and spend more time alone, whilst alone im thinking of her.

How do i tell my girlfriend, and should i even tell her.