Don't want to break up but

First off I'm super emotional this week due to my period so I think that's why I feel like this but I need opinions. My bf and I are long distance from august to may due to college. I love him and he treats me so good. It's always hard planning to visit him and him to me since our schedules are so unpredictable and varied! It's just hard because I love being able to FaceTime him after my day and destress by talking to him i just feel guilty since we both should be living more. I don't want to date other guys/ never have I met a guy I would want to date or anything like that. I just hate it cause it's been a month and I haven't seen him. Yes itspartially my fault because I have been studying constantly but it's hard to balance school and a bf and everything else rn. We been dating for 3 years and I do love him I would say yes to marrying him so idk why I feel like this! We don't argue or fight i guess we are both just comfortable with long distance and know it's not changing for awhile. I just feel like he's not 100% happy and neither am I. We are trying to plan tos we each other but flights are so expensive. I also know he can come for a weekend and idk if this makes sense but I'm used to this right now so when I see him and say goodbye it's becomes so much harder!