Is it possible to be in love forever (or a very very long time)?

I have recently reconciled with my ex. Me and him dated LDR for 2 years and then were broken up for 3. Now finally he's ready to move so we'll be living close to each other. Only thing that worries me is how I will feel about him once and if the feeling fizzles out. All in all I've known him for 5 years the feeling of love remained strong through out time. I mean the kind of feeling that stops you from eating and sleeping properly but makes you really upbeat and happy. I've been like this for 5 years and I wonder whether anyone's experienced this feeling for any longer than that, especially when I comes to living together. Is it possible to feel like this 10/15/20 years into the relationship?

Is it possible to be in love forever (or a very very long time)?
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