15, 16, 22, 23 - sorry for any youve already done!
Does your muse like receiving gifts from a potential partner? If so, what?
He will not appreciate generic gifts, though. Even expensive ones. Tag price alone doesn't impress him. Lukewarm acknowledgement and thanks should be enough of a response to those attempts, in his opinion.
It's the effort he appreciates, the thought behind the gesture. What it means to his partner. Then, the attention to detail and dedication to him and him alone.
(Could gift-giving become an ordeal with him? Yes, definitely.)
Experiences are likely the best gift for him, overall. Bonus points if it's something he can share with his partner; he values the effort and sharing activities. The latter is one of his own love languages.
Has your muse ever been heartbroken in a romantic relationship before?
For sure, mainly due to partners realizing the kind of awful person he truly is β or that his awfulness will eventually extend to them, one way or another. It takes a special sort of moral ambiguity to stomach him (underneath any perfectly civilized facade he may wear) and then some other convoluted traits to handle a relationship. Plus, he's often travelling, working or busy with multiple endeavours, enough to neglect others and keep them in the dark. Lying by omission and trickle truth will be part of it, too.
However, this situation isn't common simply because he is not prone to developing romantic attraction, let alone building a proper relationship that should warrant a meaningful attachment. Even then, his heart may break... but it is seldom unexpected, so he usually takes it in stride. He knows what he is and the consequences of his choices. He embraces them as a mere contingency to his chosen lifestyle, that is, whenever he can't just avoid consequences altogether by being utterly insincere.
Does your muse consider financial status an important factor in dating someone?
Usually not. Provided, it isn't out of idealism and romantic generosity, but just because he knows himself capable of sustaining his own lifestyle and whatever he shares with his partner. Furthermore, he prefers to pay β no matter the other person's opinion on splitting tabs and such. It is about control, yes.
Now, if he ever felt like his partner was taking advantage of him somehow, he'd be quick to get rid of them with a clean cut, and likely some form of retribution for his own trouble.
Dating people with more money than him? No problem at all. So long as they never try to use it as leverage. Otherwise, he'll make a spiteful breakup out of the situation.
Sharing the costs of an actual life together with someone else seems so unlikely to AntonΓn that he doesn't consider the possibility much. Or at all. Yet, when this happens, he doesn't care how much money each one contributes; so long as their collective needs are met fairly. (Whatever fair means to him in that relationship, anyway.) He might push to either have primary control of the household finances, though, or to keep complete financial independence.
Is your muse smooth when it comes to flirting? How do they handle being flirted with?