Search Results: shy girls, making her talk

So we do "Body Attack" together so we see eachother like 1-2 times a week and we have not spoke until one day.
My friend wanted to workout with me but "Body Attack" was too early for her and she wanted to go to the class that was two hours later so I just waited for her.
Turns out he did two hours in a row (Body Attack + whatever that was later) so he saw me and approched. We joked about how one workout was not enough for us and he told me he liked the (guy) trainer from the 2nd class he did and I told him we will see eachother next time.
After that it was mostly just us waving at eachother but we did spoke the last time about the gym again (like really spoke, not just hello)
The problem is: I got really friendly with the women and we sort of sit together mostly before class so I assume he is shy about it but it won't be too hard for me to be alone (check out my reflection and such)
I am not that bad looking (I mean still could lose some weight but I am making a progress and he sees me every week so if everyone noticed that I am sure he has noticed as well) and he is like one of the few guys I find attractive.
He is super bulky and buff (I really dont like lean or thin guys) and he has a nice face as well.
So how do I go from a girl he randomly talks to at the gym to someone he would be intrested in seeing outside of the gym?

I usually ride the train with my crush after class and we would just talk about whatever. Two weeks ago, I was going to tell him I liked him, but I chickened out and told him that a "girl in our class" liked him. He asked me who, and I just told him to figure out on his own.

He brought this up again earlier this week and started going down a list of girls that excluded me. I told him that I would tell him who it is once we reach his stop. At his stop, I confessed. He just stared at me for moment. I panicked and rambled on about how obvious it was. When I was done, he said okay. We said bye and he left.

Next day - awkward. We avoided each other. Around lunch, I avoided making eye contact or speaking directly to him. When I was telling my friend a story, he chimed in and said "oh, I remembered you told me that story". That actually eased the awkwardness a bit.

I couldn't stop crying later that night, though. My friend doesn't believe he's not interested in me. She said that if he wasn't, he would've said something. She also said that he's really shy and probably didn't know how to react. (He is quite shy and 75% of the time, he would wait for me to approach). I, on the other hand, believe that he is politely turning me down. I messaged him anyways. We talked about an exam, then I apologized for freaking him out on the train and he said no worries then went back to talking about class. I brought up this one girl who he used to have a crush on and told him that she's single now, and he completely ignored that and continued talking about studying. At that point, I was not in the mood to talk, so I ended it there.

We took the train yesterday and talked like normal. I texted him later and we chatted. He would reply immediately like usual, but then after a while, he started giving one word answers (yes, lol, nice) and using emojis (which is unusual for him). I was going to ask him to be honest about how he felt, but I decided to end the conversation there.