Dealing with a friend who shuts down

My friend completely shuts out people when things go wrong in his life. I understand that he is working through something and that he likes to do it alone, but he doesn't even answer my texts and when i tried talking to him in person he told me to "f*ck off". Am i wrong for thinking I deserve a little more than that? i understand it and I'm trying to be patient, but aren't i supposed to be a safe space for him. he might not want to talk about it, and that's fine. he might not want to talk like normal, thats fine too. but what isn't fine is him shutting off and ignoring me for a week and then coming back and acting like it didnt happen. Am i being rational?