There's one particular trope that I associate with romance anime that is just the bane of my existence.
Generally what happens is something inconsequential happens to one person in a relationship.
His or her partner notices, instantly makes a huge assumption like "Oh, he must be cheating on me!" based on nothing, and then spends the rest of the episode/or episodes avoiding the issue/person like a child.
Use your words! YOUR WORDS DAMMIT!
Not just relationships, more general than that.
How many times has conflict arisen because one character doesn't give another the chance to speak?
Oh god, yes!
That artificial way to extend drama at times. It gets irritating.