Update.

I messaged her last night saying

"You're coming to yoga with me next week"
- this was a joke between us from when we spoke once

She replied "no I'm not"

I then replied "you got much planned this weekend then?"

She replied

"Yeah I'm really busy this weekend!"

This seemed very blunt. I'm almost 100% sure she has a boyfriend now having done a bit more research. I'm currently in a lecture, she's a few rows away from me. How do I act if I see her? I think I may have come off as too laid back in person. Any advice is appreciated as usual guys.

I sat here for a while trying to think of something, anything, that might help here. The only thing I could come up with is "what are you doing next May 15th?"

At the moment you're getting the fingers stuck up at you. This will at least throw her a curveball and have her thinking "what the fuck? Why?" instead of "how do I get rid of this guy?"

It'll force her to either be at least a little civil or remain curious.

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If something's not fun, it's not worth doing

I sent her a message in snapchat messenger saying "you're coming to yoga with me next week" She replied

"No I'm not"

I then said "have you got much planned this weekend then?"

Then she said

"Yeah I'm really busy this weekend!"

I just said "fair maan, have fun!"

I bumped into her in the gym two days later whilst in my Golds vest. I got a snapchat from her friend of the girl that night saying "HB8 said you looked good in the gym x" HB8 was embarrassed hiding behind her hand in the photo. I replied

"Thanks but I have a wife and kids..."

She replied with another picture of the HB8 unaware saying
"Is the wife HB8?"

I replied a while later "Not that I know of..."

I didn't get a reply but I know they were on a night out.

What shall I do to escalate this relationship?