1. Falling out of love depends on a number of factors, like your submissiveness, romantic/aromantic trait, low self-esteem perhaps? Hard to tell without knowing your stats, but usually if you want to get over a guy, avoid contact with him and date another that your MC finds "the perfect specimen of manhood"
2. It's just the same script over and over again. The only options you get are choosing the male actor, and deciding whether he should creampie you, or cum on your butt.
3. It should still be possible, as long as you are at least good friends. Still, if you break up with the guy, he may hold a grudge, so perhaps it's easier to find some other sleazy guy, who will "miraculously" come up with the same million-dollar idea