What would you do if your sisters husband always talks about his ex-wife? What advice would you give her?

My sister and I were on the phone and she asked me what would you do if your bf was talking bout his ex? I am very curious.What would you do if your sisters husband always talks about his ex-wife? What advice would you give her?
He does it because he is still thinking of her and probably still loves herWhat would you do if your sisters husband always talks about his ex-wife? What advice would you give her?
How does he talk about the ex (just in passing, like he misses her, like he hates her)?? Any which way I say he must be insecure about something...
Obviously he must be thinking of his ex, I would wonder why that is.
I would tell him that I'm not interested in those stories!
I would slap him in the face and say to quit disrespecting my sister.
ya i would deff talk to him about it.. something is going on..

skin