Boyfriend

So I’m dating a senior and he’s graduating this year and all I can think about is the fact that I only have 4 months left to see him before he has to leave. I get super depressed whenever I think about it and idk what to do because I really like him and I don’t want him to leave but it’s not up to me. I’ll go from seeing him everyday to listening to his voice or seeing his words once a week please help...