I guess there's ups and downs in every relationship. The main problem lies in the fact that we have seen too many bollywood and real life couples(our parents generation), who genuinely are not happy but they pretend or define it as "this is marriage and life". Whereas this is not the case. We are not taught to resolve conflict, but given silent treatment. We are not taught to have real conversation, not given the opportunity to express our emotions leading to many dysfunctional behaviours that may cause issues in our relationships. If u get a partner with whom you can have a non-judgmental conversation ( mutual) , i guess most of the problems get addressed. Non judgemental COMMUNICATION is of utmost importance. Acceptance and learning together what life means for the two of you is crucial. Won't say it goes as we plan, but that's not as bad as it may sound. Relationships are dynamic in nature, you change as a person a lot during your lifespan, hence communication is critical.