Is 3 months a long time to wait for someone?

My fiancé is in the military and he's gonna be away for three months before we get married. I'm nervous that he'd lose feelings for me or I'd lose feelings for him. 3 months seems so long away and I don't know how I'll be able to spend an entire summer without the love of my life. I know that when he gets back, he'll probably be all over me but I can't be patient. What should I do?
Is 3 months a long time to wait for someone?
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