Threatening to leave a relationship every time you argue? That was me.
I wrestled with the idea that I could disagree with someone, even be angry with them... and still love and care and want a relationship with them. One disagreement and I would be packing my bags.
Short-term, I would feel free and liberated. I would go do all the things I "couldn't" do because I had been in a relationship.
Long-term, I would get lonely again and come crawling back to the same relationships, over and over again. Wash, rinse, repeat.
That's no longer how I deal with conflict in my relationships. But I remember when it was the ONLY way I dealt with conflict.
Small problems can build up over time. Whether it was because I was too infatuated to care about the problems, too busy to address them, or too confused about how to go about solving them... they would continue to built up until they exploded. An argument would ensue, angry words...