Heather is right, setting boundaries is the best approach and also understanding the sexual maturity age and how they go about choosing partners. Unfortunately for you, you are not a parrot, and like all animals, they are meant to reproduce. If they can't, they may actually turn on the "mate".
Same as when lionesses deprive a male lion to mating rights, its bad, but its nature. If we have a better understanding of how they function in natural state, we would be able to try avoid a lot of problems. No matter how we try, sometimes it doesn't work, and you must be prepared to face the consequences, as he may love you too much and become aggressive or obsessive.
In my case, I had a beautiful ringneck, and at the age of 4 he was half featherless, as he was obsessive over me. Once those follicles die off, you are sitting with a featherless birdie for life. Mine sadly passed away at the age of 13. So making a very carefull and informed move is the way to go. Remember, he is already inlove with him, so shock treatment is not the way to go. Take it slow, cut short every now and then cuddle times, do different things with him, and try not enticing him, pet him differently so he doesn't get stimulated, nor irritated. Try a few things and wee what works for you two. Its a process, but will be rewarding to the both of you in the long run.
