Haven't heard from my boyfriend in 2 weeks. What should I do?

My boyfriend is in college and in a fraternity. I haven't heard from him for the past 2 weeks. Oddly enough neither has ANY if his family. My cousin who calls to his university said that the frat my boyfriend is in closed their doors completely to nonmembers which ig is uncommon for them because they're constantly bringing people over there. My boyfriend won't answer his phone and finally I called one of his frat brothers and we facetimed. They said he is just going through something really hard right now. His other frat brothers got in the call. They said they can't tell us what's going on with him because he doesn't want anyone to know or to talk about it but just know he's fine and safe and to tell his family he's okay... This all has me so worried.
Haven't heard from my boyfriend in 2 weeks. What should I do?
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