Needing advice

I recently got out of a 2 year relationship about 2 weeks ago, after i just didnt feel it was right (i feel fine as i feel like we emotionally broke up months ago). Before me and my ex got together i was extremely close with another boy, he really liked me however i didnt feel the same way, and it really hurt him when i got with my now ex. Hes changed alot since i was close with him, hes became much more popular and everyone loves him now.

I know that i shouldnt have felt like this but for the last couple months i have been thinking about him lots. When me and my ex broke up, he messaged me asking how i was and what happened and saying such nice things, complimenting me etc. He came to my house at 11 and stayed and we just talked until 1:30am. we have only been messaging for the last couple of days but he seems very blunt and distant with me all of a sudden, and he wont start the conversations anymore.

I feel so crappy about this because i literally adore him but I’m starting to feel like i just adore the past version of him, but hes changed and i just cant get over it, i think about it constantly and its literally taking over my life :(

I know i should just let go but i cant, i feel very alone at the moment since going through my breakup, can someone give me advice :( im only 16 and really want to be able to be alone for a couple months but ive just been so held up on this for so long that i dont know if ill be able to get over it :( thanks