Its very easy for people to fall in love with the idea of someone. But in truth, human beings are constantly evolving individuals which means they often change. If they are not growing with you, then that picture you cling to is no longer valid. It might also be good to know if the two of you have individual identities away from just yourselves. Usually a healthy couple is one where both parties have individual pursuits but always share the core volume of time to together where it matters most. Do you have things you aspire to do outside of your partner?