I am a firm believer that when it comes to relationships that familiarity breeds contempt. By this I mean, it is nice to have similar interests, but you are going to eventually need alone/away time from whoever you are dating.(not much, but some) If this is going to end up being serious you should have at least one or more interests that your SO has no interest or just a passing interest in(as long as she isn't going to nag you or really hates them). Although doing things together is really important. She should also be intelligent enough to carry on a decent conversation. I find this to be actually more important than anything else. By the way, I think you were possibly setting your expectations to high. It is better to go in with no expectations, especially early on. I know, all bad/crazy/rambling advice. Feel free to ignore it or do the opposite. Although I wouldn't consider myself Costanza like.