Why can't my brother date someone else?

He's currently in a relationship for 2 years and the girl is from Venezuela. She's at intermediate English at the point and a permanent resident.

The issue is that many people from Venezuela are already having a bad reputation here and in other South American countries. Chile doesn't want them and neither does Brazil. Several of them are behaving in a rather uncivilized manner, lately on the news two Venezuelan men (immigrants) killed and raped a 12 year-old, some of the women are conceited themselves and disrespectful toward people's foods and in everything. Then several of those poor migrants expect to be given food and everything for free, wasting our time.

This is the news about the two Venezuelan migrants:

I get that he loves her and how that's all that matters, but given the reputation they've earned within these recent years, why can't he date someone else?

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It's they way they're behaving that ruined it all. They now have a bad reputation.
Why can't my brother date someone else?
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