Being broken up with is no cake walk, in fact, its a terrible thing. Often times, it happens in sort of a surprise way, and you begin to question your self-worth and the confidence you once had plummets. I know this. It sucks. But breaking up with someone isn't easy either. Realizing that someone you thought was a potential life mate is actually not what he seemed is almost as difficult. You have to play the waiting game and see if maybe these thoughts are being brought on by your period or something. If no, you have to figure out the best way to let them go gently, I can't do it any other way. This also sucks.
If humans could have the romantic lives of say, the carrier pigeon, we wouldn't have these issues. We could just go around, finding a mate, mate, bear offspring and go on. Of course, human young take the longest time of any animal in the history of ever to leave the proverbial nest, so maybe we should only go out on these sex hunts every five years or so. Hey, what are contraceptives for? Oh, that's right, the in-between babies times when you don't want to birth another child! It would be great, since the children would have different fathers, there would be a variety of personalities, so a mother would never get bored. Maybe the guys could pay into a big "Baby Mama" fund, I don't know I haven't thought that far ahead.