Poor communication makes relationships much, much harder than they need to be.
Whatever it is, whatever you’re afraid of saying - Just say it with love and the intention of *creating* shared understanding.
Similarly, whatever you’re told, whatever you hear from your partner - receive it as a gift (all truth is a gift) with the intention of *finding* shared understanding.
If you argue to win, then you’re destined for a very, very hard life. If you react to hard truths with defensiveness and recrimination then you will have a hard time getting the truth again.