So one day at the gym I saw my childhood crush from school(when i was like 15) in the gym and didn't talk to her all at once. We texted a lot when we were kids and said i love you and shit lmao but nothing happened we didn't even talk in person due to academics and shit.

After a few days I cold approached her and talked about the correct form of an exercise. Then I reminded her about it and she pretended like she didn't remember anything from the past. Talked a lot in the gym (she was reciprocating a lot in the gym and escalation was easy there) and after it for few days and took her Instagram, her energy on chat wasn't the same as in the gym and it turns out that we both are in a long distance relationship now so her boyfriend must he having her Instagram account for sure.

Texting her wasn't fun at all so i unsent all the texts from my side and blocked her, then told her in the gym that I've deactivated my Instagram, ignored her and talked while being cold as hell giving no fucks showing no desperation and said bye as soon as we got out of the lift. Now I'm thinking of taking her number and talking only on calls. I still get butterflies by seeing and talking to her because it's somewhat unfulfilled childhood love lol but i don't know what to do next, I'm thinking of escalating to fwb terms but shit seems difficult to achieve. Advice needed what to do next please!!!