He’s falling out of love with me

Me and my boyfriend have been together for 4 years now, since we were 15. We started uni this year but he moved 3 hours away from me for his uni which is perfectly fine we said we would facetime everyday and we would be fine. it’s been a month since we moved to uni and he’s stopped calling me as much, he doesn’t text me as much he doesn’t put any effort in anymore at all. He’s hanging around with new friends and I’m watching him fall out of love with me everyday and i just don’t know what to do :/