How do I tell my younger brother to move out of my house?

he’s been living with me for the last three years after his marriage (of 4 months) didn’t work out. he’s 28 years old. shouldn’t he be living out on his own? he has some emotional/self-esteem issues and keeps developing more ocd quirks. i don’t want to be mean, if i don’t have to. he did talk about moving out a while ago, but has recently started talking about home improvement-type projects he’d like to start.