Marriage does not usually fall apart because of one huge fight. Sometimes, the real trouble starts with things that seem too small to matter. A sarcastic comment here, an ignored message there, a habit of keeping score. Over time, these little patterns can create a distance that neither person notices until it becomes difficult to cross.

The tricky part is that many of these habits do not look harmful when they happen occasionally. It is when they become the normal way of dealing with each other that they begin to affect a relationship.

Here are five such habits that couples may want to watch out for.

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