how do i know if im making a mistake?

i recently went no contact w my ex of 3 years. we’ve had it rough last year most recently lost our dog on christmas eve it was really emotional. although it’s felt sooo different in the end of the relationship so much had happened and changed that the couple we once were felt so far. very disconnected at times when we’d try to fall back into old ways. but with his flaws, he was still the best boyfriend i’d had and really a great guy. i just feel so different then i once was. i was 19 when i started dating him and im 23 now i just feel DIFFERENT. but i’m wondering if im just being young and immature or if maybe me and him aren’t meant to be right now. i feel guilty because he wanted to try to work it out and i tried but in the end i just couldn’t feel what i once did. i love him always im just feeling guilty for kinda writing him off. i’m trying to trust my feelings and there were times i felt suffocated or controlled or judged while i was with him. like right now im single and i feel relieved a bit and free but also i have no idea what im doing so i feel like what if i wrote off a good guy and it set me up for not finding it that good again. idk does this even make sense??