Confused about what I’m feeling

So I just need another opinion on this. Im 19 abs in my first year of uni studying medicine. Im also a national athlete and therefore am finding that I am very busy most of the time. I have a boyfriend who I’ve been with for about a year, who’s at a university about an hour and a half away. Before leaving for university our relationship was great and we got on amazingly, but as times gone on I have found myself struggling more and more to be a good girlfriend. I rarely have time to FaceTime, and we definitely don’t text as much as we used to. We also are only managing to see each other about once a month, and I can’t really see this improving. My boyfriend has said how much he loves me and how he will do anything to make our relationship work throughout university but I don’t think I feel the same way. To make things harder, he is an international student and lives on another continent during holiday time. I am under pressure from both my studies and my athletics, and so I don’t know if I can cope with a challenging relationship on top of that. I really do love him, but I am not sure if I am meant to feel so tired of the relationship. Has anyone else experienced anything similar, and does it get better or should I talk to my boyfriend about it. I just know that if I said what I’m feeling he will be hugely upset.