Answer:
They never were together.
Eros(a.k.a Cupid) was mad with Apollo because he'd been teasing him. He got revenge with Apollo by shotting him with a gold arrow (to make him fall in love with Daphne, the nymph) and shot Daphne with a lead arrow (to make her loathe him, that, and she was chaste).
Apollo chased after her and she begged for her father's help (Peneus)and he turned her into a laurel tree. Apollo swore to 'keep her' by his side, thus, why we see him and a laurel crown.