I have been in a long-distance relationship with my boyfriend for five years and got married this year. I was really scared in the fourth year, I think.
Girls are really vulnerable in this respect. Especially when you are sick and stressed. But in the end, they all persisted ~
I think the way to overcome the distance is to keep warm and miss her all the time. Send messages, make phone calls. Go and see her sometime. I usually give her some small gifts to surprise her ~
Love is infinite ~ in addition, you should trust her ~ don't doubt her firmness to you too much.
Finally, I hope you have a lover and everything will be fine.
Happy tanabata!