Though you might be attracted to each other for your minds -- you could really look up to each other intellectually and admire all the smarts your lover has that you think you lack! -- that imbalance between you doesn't serve you well long-term. Your partner has always had trouble giving themselves their proper due, meaning, they tend to tell themselves they're not as smart as they really are.
This relationship supports that negative feeling in them, because you two have minds that work in very different ways from each other. You try to talk to each other in the ways that each of you knows how, and it just doesn't get through very effectively or reliably. Your partner ends up feeling not supported or heard, and misunderstood -- and if you have insecurities as well, you start taking more and more of the blame onto yourself, even if it's not really your fault. The fault lies on both your shoulders, and it's hard to work this out. You want to make a connection, but you just are not able to. Misunderstandings are frequent and upsetting, and you might even be starting to feel like it's easier just to keep your mouth shut, even when things happen that really bother you. It's hard to get your needs met in a relationship when you feel like you can't even speak up about them! Making this work long-term will really take some conscious effort on both your parts.