She really made him feel insecure about something he was born if and shouldn't have to change. Why even bother dating the guy if you're put off by how he looks (to others)
Like a few comments are thinking below, i think he’s half dead or some sort. The stitch marks on his neck plus his memory loss makes me think not all of his body marks are just tattoos. That as well as his lower iq to put it nicely.
So Michael and Lucifer fucked and had this baby?