Romantic Songs to Dedicate to my boyfriend on his birthday!!?

Hey there. My boyfriend is turning 21 tomorrow. We have been in a relationship since 4 and a half years now. I want to dedicate a beautiful slow romantic song to him on his birthday along with some lovely beautiful lines that might cheer him up. So music and lover buffs help me out plsssssssss!!!!! I need latest songs like from the 90s and if the song is really really good then it could be from the olden days too!!thanks in advance!