Love is not irritable, the Bible tells us.
Irritability is something that can grow over time.
Familiarity and relationship express themselves in passive/aggressive carping, venting, language and tone that would not happen if the relationship was newer or more distanced.
It can be a sign we’re taking someone or something for granted, or believe we’re in a position where their feelings don’t matter so much.
Philip Ryken talks about irritability in this video, originally posted on Desiring God.