আপনি can't stop them from leaving. They're going to leave even if it means leaving আপনি behind. Long-distance relationships are tough but very possible. আপনি two have to keep in touch and remember through the tough times why আপনি fell in love. Write letters to each other, talk on the phone, Skype.... There's so many ways to stay connected. If that doesn't work out, আপনি need to officially break up and try to সরানো on. It'll be tough and you'll have horrible days, but eventually you'll get over him. Hope it helps. Good luck!