Do you enjoy this dynamic, or use it often? Personally, I use it all the time; I think it's actually easier than having a villain who hates their hero. ^^
It's probably because I like creating villains who have fun with their work, and it's easier to give them that attitude when their relationship with the hero is fairly amicable- at the very least, they won't see them as a threat; merely a plaything~.
On the darker side, twisted love stories always hold a lot of juicy drama~. I like to try things that are slightly outside of the box...a villain who tries to cover for their attraction with excessive violence, for instance...or a villain who tries to strike an absurd balance between impressing the hero and actively destroying their life- not that they think the latter will lead to the former, but that they think they can have their cake and eat it, too.
Something I've been doing a lot lately is a sort of 'white knight' dynamic: the villain takes pride in the fact that they'd cross any line for their hero, and more often than not they really are trying to help them, but they do it in ways that mostly just cause harm: they straight-up murder people instead of trying to negotiate, and/or they restrain the hero and take action in their stead (sometimes in their name), believing that they know better, or that they're making some kind of noble sacrifice.
I don't normally do it with main antagonists, but I find it's a fun and reliable source of extra frustration when it comes to secondary antags (who are usually more hated anyway). It's interesting to have these characters around who are genuinely useful at some points and just out of control at others. They make you think, "gosh, this person could actually make a decent ally if they weren't so dang creepy." XD