When you meet someone in a relationship, your partner should accept you for who you are. If they don’t or they can tell you that is going to be a problem later in life. Before a relationship gets serious. The partners should discuss their lifestyles and if they’re willing to change. I don’t think that someone should have to change their lifestyle in order to fit the needs of their partner unless it was like for death.
For example if one person got very sick and was hospitalized for long period of time than the other partner may have to change their lifestyle in order to help their spouse. Otherwise people have to give and take in a relationship but I don’t think that means they change their lifestyle.