In relationships, that's a problem. Over the years, that really developed into ... something. When I have a crush and daydream, I imagine how she comes onto me, and I'm like: Sorry, not interested.
Sometimes that actually happens, and it does feel great.
Even when I daydream about meeting a cute girl with a nice personality, I imagine how she likes me, so I can reject her.
The oddest thing is that I still had a couple of healthy, nice relationships, some over many years. She was always more into me than vice versa, though. And I was overall single longer than I was in relationships.
So maybe the counterpart personality exists, and that's why it works: Longing to always having to prove herself to someone who isn't even that attractive, just for getting a fraction of it back.