This is Morning Mood by Edvard Grieg. I usually see it more associated with, well, the morning, than with love. Especially in cartoons.
To such an extent that the Simpsons did a takeoff on it, even.
Was sure you were talking about one of the other suggestions, especially the Tchaikovsky love theme from Romeo and Juliet, haha
Ahhhhhh hahaha
The sax solo in this feels like a dentist’s drill to me