First of all, you need to come up to the surface and breath. You need oxygen to live! Don't keep drowning in the memory of something long gone. Stop asking when he'll return, and stop asking whe you'll forget hin-that will only keep the cycle won't work if you keep reminding yourself of him. So now, just cnome up to the surfac and live as if you neve knew im. See other guys, more on your studies, then you'll easily get over it.