She doesn't love him, she's just in love with having a relationship and she gave into the pressure of her family and friends to get married at her advanced age.
He might as well just continue to fuck her until his time is up.
Sounds like she's lonely as hell and she might be trying to get some dick out of you.
Judging by your actions, you're not going to smash and there is no reason to tell your brother because with the time he got, he has to understand that someone is going to fucking her. Hell, even Winnie Mandela...