Wanderer, or the name you choose to call him was always aloof though kinda protective of you for being along and helping him in one of his vulnerable states after begging a new life embracing his old mistakes and trying to be the better him making him attached though he wouldn't admit it, so seeing you almost replacing him with a silly and flirty guy like he used to be in the past though not that friendly made his abandonment and trust issues overwhelm him. He IS YOURS. And you ARE HIS.