How to save a long distance relationship?

Recently I have fallen inlove (?) with someone. It's scary to think about that since he lives far away. He said he is going to buy a plane ticket and spend the summer with me but thats awhile from now and a lot can change since we are already having problems. for some reason his wifi has been acting up, should i believe him or is that a sign of cheating? also, we argue a lot. But, i love him and he says he loves me to. Age will not be mentioned since peoples answers can differ but we are teens. How do i make him miss and love me until we meet and not fall for someone else? how to save this? i really love him.
How to save a long distance relationship?
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