She's Got A Big Ego?

The idea for this post came from a recent conversation where the question was raised "Why is it that a woman will break up with a dude because she no longer wants him, but she doesn't want him with another woman either?"  The conversation went on to eventually say that this is particularly true with baby mamas which is probably where the phrase "baby mama drama"  was formed. The thing is that I, not having a child of my own, can not possibly say with certainty how it feels to have your baby's daddy move on with someone other than you, however, I'd gather that it must definitely feel like the ultimate betrayal. Most of us have dreamed of our picture perfect family for years and to have that dream taken away is devastating even more so when a child is involved. However, I must also say that I do know of circumstances where the child's father has been pushed away and then punished, usually by keeping his kids away from him, when he finally decides to move on. Now a few theories on this have been presented to me such as, "She thinks her 'love' is so good he'll never leave so she doesn't know how to handle it once he finally does" or something as simple as "She doesn't want to feel like she's been replaced". Whatever the case may be, it can be a tough situation on all parties involved... What are your thoughts on this? Why do you think women leave men then get upset once the men have moved on? Let me know, leave your comment below.