AIO/ Am I overthinking

My ex best friend stoped being my friend I’d rather not exactly say why but I did apologize to him and he said “I accept your apology but I’m not in blocking u “ I said ok that’s fine for now a few days after he hugged me and we have had ok conversation since than but before we stoped being friends we would argue about everything I did and got closer to one of his friends and started hanging out with me less which wasn’t normal last year when spent Valentine’s Day together Christmas Eve the day before thanksgiving my birthday the day before Easter he doesn’t seem upset about it it feels like I’m the one who lost everything and he said I had serious issue ( I don’t plus I’m in therapy ) and when he wants me to change he doesn’t give enough time to do so I miss him but it feels like nothing will be then same do any of you have advice ???