Jesse is completely head over heels for Rose, he felt love at first sight when he saw her and continues to chase after her even if he knows her affections lie elsewhere, he'll always love her no matter what.
Saphira is a very good friend of Jesse's and he looks out for her whenever he can, not that he minds doing so anyway, she'd always been kind to him. He trusts Saphira with all his secrets and anything else in his mind.
Jesse is unsure of Ryouta, though they get along it seems he must compete for Rose's affection when she is around the two of them which he doesn't like having to do. It seems that Ryouta usually wants to taunt him about him being second best.