Like and love are two different things. Like is when you know the best side of someone and like them. Love is when you know the worst side that someone could ever have, and you still love that person with everything you have in your heart.
'I Trust You' is a better compliment than 'I Love You' because you may not always trust the person you love but you can always love the person you trust.
The essential sadness is to go through life without loving. But it would be almost equally sad to leave this world without ever telling those you love.