These might be a bit more serious than you are looking for, but they are short and simple.

Some people come into our lives, leave footprints on our hearts and we are never the same.
We come to love not by finding a perfect person, but by learning to see an imperfect person perfectly.
My best friend is the one who brings out the best in me.
Henry Ford

When they asked me what I loved most about life, I smiled and said you.