How do i build up the confidence to move on?

so ive been single for almost a year now, ive worked my *** off to lose weight and im starting to take more pride in my apperance, im normally super confident and i still flirt like a horny 15 y.o girl, but i cant bring myself to even kiss another man, ive got 1 admirer, who ive actually become rather fond of, he understands i dont want a relationship i just want fun, but i can bring myself to take the plunge does any one have any ideas to help me <3