We don't talk nearly enough about "papercuts" in a relationship. Everytime there's raised voices, cruel words, lack of support, short temper, lack of affection, etc., a tiny wound is created. Not enough to make you leave, but enough to make part of you pull away & lose a little love everytime. One day those wounds create a chasm so deep its unfixable.
What isn't a "big deal" to you today could be a chasm tomorrow. Nurture your partner, walk with gentleness, & apologize freely. It's much easier than living with regret at the edge of a chasm.