Is it obvious I was talking to this guy but making the interaction last longer to get my ex’s attention?

He was asking how I got on with the leg press I said fine thanks I was okay with it and then I noticed

my ex was coming downstairs with a 20kg dumb bell so walking slow and being very non observant I was looking the mirror waiting for him to get to the bottom so he’d observe the encounter, the guy talking to me looked to see what I was looking at and had a “?” Look on his face and said “oops” then tried to leave, he left quickly and walked away fast as soon as my ex reached the bottom of the stairs I shouted back “thanks for showing me” with a flirty smile as he was rushing off, at this point my ex was right next to me (the man doesn’t know that me and him had history ) but does it seem obvious to either parties?

Is it obvious I was talking to this guy but making the interaction last longer to get my ex’s attention?
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