Long Distance Advice Needed

My boyfriend whom I met in college just moved back to his country and now we’re over 2500 miles apart. We were in a long distance relationship for 6 months after graduating (he lived in a different state) and now he just left. I love him with all my heart, I honestly cry with just the thought of losing him, he’s like my best friend. At the same time, I’ve never wanted the stress of being in this kind of situation because i get emotional when i think about not seeing him ever again. Every time we’re together it’s like we’re on a timer or this imaginary clock. I’m going to grad school next year for 4 years. He thinks we will be okay seeing each other once a year but with dental school I’ll barely have a week of break available, so therefore we were bound to be in a long distance relationship anyway because I’m going out of state. He plans on staying in his country until opportunities arise for him here. We try our best to communicate everyday but often times the WiFi connection doesn’t work. In your honest opinion, what are y’all opinion on our type of long distance relationship. We’re both 22 if age matters. & i don’t plan on marrying until I’m done with school.