The Annie Hall Effect

Negative feedback of compatibility. In other words: when the process of being in a relationship with someone makes that person become less compatible with you. 

Named after Annie Hall (1977), where the eponymous Annie is initially very attractive to Woody Allen's character, except for the fact that she is not very educated. When they live together, he convinces her to take some courses at the university. This makes her conspicuously more like him, a shock that their relationship is not strong enough for.