he's not someone who holds grudges very often, but if someone were to learn of his past and taunt him with it, he will be more inclined to make an enemy out of them. them using past experiences (ie. death of his brother, past tortures or other trauma) against him will make him reckless and may push him to a psychotic break where he goes all out and tries to kill y/c. something else they could use to get to him would be to threaten his husband, whom he just reunited with. this plot would be a rly good chance for me to develop him more!!