i think before you marry someone, you should sit down and go through the AITA subreddit with them and see what their take on those situations is
does your potential future spouse think it's reasonable for their mother to be involved in your family planning? or to make comments about your body? do you? how does your future spouse feel about girls and/or boys nights? situations involving exes? cancelling trips last minute? under what circumstances do they think it's reasonable to host somebody in your home and for how long? etc.
and the goal of doing this isn't to agree one-hundred percent on every single thing. it's to understand how you both view obligations, family, friends, finances, conflict, etc. and to make sure that even if you don't have the exact same perspective, you can understand where the other person is coming from without feeling like they're a crazy person. you have to be able to come to reasonable compromises and sometimes that involves one person fully caving, and sometimes it involves the other person fully caving, and sometimes it's both of you giving a little, but you need to understand what things you both are and aren't willing to compromise on because those types of situations are going to come up in a marriage.
also, since this has turned into actual advice: you should talk through why you think what you think, even when you agree, because you might not be agreeing for the same reasons.
