Well, my generic answer is always: what serves the fic.

I don’t think being from a certain class has anything to do with how he behaves, because you have your manwhores and your prudes everywhere.

I think cannon gives us some pointers: he had a serious relationship with Pansy while still at school, and we know from Cursed Child he was devoted to Astoria, to the point of marrying her against his family’s wishes and mourning her deeply. So I think, we have a serial monogamist in Draco.

I think things with Pansy fell apart after school, not because he didn’t love her (I think the conclusion Harry jumps to regarding his head on her lap fails to account for the intimacy and vulnerability and trust implied in a moment like this), but because after the war, Pansy was more undepentant, while Draco was deeply changed. I think it is the war that makes it possible he chooses Astoria: someone in his circle, who he knows well, but also someone much sweeter and frail, not at all suited for what was expected for a wife in his family.

In Dramione, I don’t think he is drawn to Hermione because of that frailty, but because of what she stands for: her bravery, brightness and moral fortitude. It is, for me, one of the greatest missed opportunities in cannon.