There isnt much to think. Take the dog to obedience classes first thing. You seemed to want the dog until you found he is intact. Dogs aren't rapists, and unless there's something you haven't said, he isn't a mind reader either. Many dogs aren't interested unless encouraged. Theres little-to-no threat of something happening unless you want it to. But the obedience classes will give YOU a bit more confidence in being able to handle him. If you do know something more, we're quite capable of answering questions about that, and there is quite a bit of written info here as well.
The alternative is to give him up for adoption/ rehoming. I dont see that as a good outcome for either him or you, but its your decision....
A dog is a dog. He doesn't have to be your lover, nor you his. Most intact males go their entire lives without sex...and there is no real harm done by that....its in the genes. So that's one less thing to feel guilty about. Id say leave him intact....that surgery is invasive, and has its hazards.
Bueno Fortuña....