Someone should know you love them without you always telling them. A simple jesture, a smile, a touch, the way you look into their eyes, letting them see your heart And most of all let them know anything they have to say no matter how minor, is important to you.
When they are not with you physically they will always be with you in your heart and mind. Whenever they have a free moment of thought your eyes and heart should enter their mind and heart. If this happens you know you have made that special and lasting connections. This is a true love that will never die and doesn't have to be reinforced with words.. Don't get me wrong, You should still tell them you love them, but, They should always know it whether you say it or not. IMHO