I didn't have the time to answer earlier, but it seems to me that you are of the view interracial relationships fail at the same rate as intra-racial relationships within Somalis. I don't have data on hand to prove this, but on the face of it we know this is patently absurd.
Sure Somalis have a divorce problem, but generally speaking when two young Somalis are having issues in their marriage the families will intervene and fix things. In other words, both families have a stake in seeing the marriage remain intact and will do whatever they can to achieve that end. Whereas when Somalis marry out, and that's both faraaxs and xalimos, their families are at best neutral and have no interest at all in seeing their marriage flourish. They have no support or guidance from their community, and you might think that is a completely useless thing but it's what can either make or break a marriage. This is very generally speaking, of course. I'm sure there are exceptions here and there.
That's why I said you're at the other extreme end of the spectrum.