Even Jay with memory loss can't help but be in love with his girl. His whole body and mind and heart needs Nya, he just can't help it.
Jay: Somewhere out there, my soul mate is waiting for me...
Jay: I can't be with anyone else until I find her...
Jay: Because if I do...
Jay: My soul mate will probably murder them. So it's really for the Merlopian's safety for her to stay single, you know?