You and Michael have been sleeping with each other for a year and 5 months. At first you two don't seem to have a lovers kind of vibes that you pick up from each other so you continued to sleep with each other without commitments.

Michael has been acting weird for the past 5 months, he's acting weird if you mention other men, you both argue a lot since then because of this, like right now.

"Oh i didn't know you were dating someone" he said sarcastically.