Why does he get jealous even though he doesn't want a relationship?

Anonymous

Whenever I would mention any hot guys from our class as a joke he would get super jealous and go like how he's so much better. Then he starts mentioning cute girls from our class to make me jealous. I also met his roommate and when we were discussing my height he asked me to stand up so he can estimate and I said no but when his roommate asked and I stood up he got so upset (like ohh you do it when he says but not me).

I even mentioned my celebrity crush and he goes like meh he's okay and starts talking about how hot his wife is while clearly sounding jealous.

Updates
1 y
After we had s3x and he was cuddling me, I jokingly mentioned his roommate and the guys from class and he's like well they ain't the ones lying naked next to you in bed...
Why does he get jealous even though he doesn't want a relationship?
3 Opinion