Even though he is a guy who has a girlfriend, he doesn’t believe this precludes him from being flirty with a girl.
If anything, he didn’t see anything morally wrong in flirting with you, as he already knew he had no intention of taking matters any further than flirting.
This is how he sidesteps having to contend with a guilty conscience or any culpability in flirting with you or any other girl.
Since you are attractive too, which means you have a pretty face and a physically fit body, you fall right in line with what attractive guys would want to date.
After all, guys are stimulated by what they see, and an attractive woman certainly falls in line with what he would want to see and date.
Nevertheless, you are being too presumptive of attractive guys.
Given that you are used to guys you don’t deem attractive showing an interest in you, you are expecting the same kind of behavior from attractive guys.
What matters most is who aligns with all the critical factors required for a long-term relationship to work.
These are critical factors such as her professional, socio-economic, religious, educational, and cultural bona fides.
Since men are highly stimulated by what they see, they often make the mistake of picking the pretty girl based on her physical looks.
In doing this, he has ignored that she doesn’t align with him across multiple critical factors but rather is caught up on how she resembles a supermodel.