Relationship advice

I(16F) and my bf(17M) have been dating for around 4 years now and we are pretty serious about this thing. We have had our phases of being stupid and egoistic but all turned well at the end. So due to boards(we are from India) we couldn't talk for nearly 5 months because our phones were taken and before that we had some miscommunication going on too but we sorted it out when we reconnected after boards this month. So he told me that due to some family problems he has to go into a foundation school to comete his education and study for NEET(standardized test for medical field in India). I got scared and anxious and told him some hurtful things but apologized later. I feel so shifty about it now and he's kind of upset too. Phones are allowed there and he can come home too. I just overreacted and now I am regretting it. So what should I do to apologize properly and I also need advice on how adjust into this situation.

tldr:bf is changing school and moving for 2 years to study and I overreacted and said hurtful stuff and now I need advice on how to figure it out.