Why has he gone cold suddenly after being interested?

Sounds like he’s trying to move you to being a professional acquaintance now instead of friends and telling you to only contact him through work channels.

It's weird hes the one who wanted to be personal? is he maybe getting annoyed if I've gmber gotten over dependent on him?
I feel like maybe he might miss the chase or something? was thinking of not texting him at all cause it's too weird to go to his work number giving him space?

Sounds like he’s realised that the relationship should be professional instead.
Maybe that’s just how he gets clients if he’s a personal trainer by making them think he’s interested.
If you don’t want to contact him, don’t. If you want something more, ask.

Its weird cause its been like almost a year and he definitely seemed interested? or do you think he might want space? I wasn't really training with him anymore and he never really saw me as a client. He's always acted way extra with me. Even one of the guys who helped me out one time were like you used to train with him. He's always touching and responded back to mine there was a vibe chemistry.
I don't know I do feel like maybe because I texted him all the time asking if he was there to help? hes getting annoyed at that even though hes the one who wanted it initially. Maybe I just give him space maybe he felt the chase was over or something as well ? don't text him at all? there definitely was something there and he spoke about me to his friends etc. The text caught me off guard . I didn't reply left it on read . Maybe I give him space stop depending on him it's a weird situation . I was even myself starting to wonder that I could be over dependent without realising .

It’s been a year and nothing has happened?
Doesn’t sound like anything was ever going to happen tbh.
Don’t start playing stupid games. Either ask him out or move on.

Well more months there was lockdowns in between. But it definitely felt like we were getting closer only the lockdowns were happening.
It's weird he introduced me to his friend randomly as well . I'm not sure how I'd ask him out after that . There definitely strong chemistry , I had noticed it changed recently . He gave his personal number for a reason. and the other day during bench we were chatting a lot , complimented him something about his training saying his arms were getting bigger it's working. Noticed he was standing much closer to the bench as well. He gave fist pump at some point I did that and grabbed rubbed his hand he didn't move away. And offered to get me in for like a extra bench to help me. At the end after I went to wipe the bench instead of leaving him to do it he was like "you hardworking woman" . We flirted a lot . Or should I give it time don't text him or anything train with someone new. I feel awkward around him now after that feel like I need to take a step back for a while. He definitely seems like a guy who enjoys attention and hes competitive he may just enjoy the chase felt he "got me"

None of that is anything new to what you have already said.
You flirted-nothing happened, now he’s pulled back.
Either make a move or move on.

Would he not pull away further if I ask him out? if hes already pulling away? maybe I'll ask him eventually give him space for now maybe in few weeks see whats up. also cause I still have to see him around the gym . Would there be a reason he pulled back?

He’s not interested or has found someone else.

Move on.co

Will the interest come back ? like he seemed super interested at the start