What does it mean if your ex starts being nice to you all of a sudden?

Anonymous
I am just curious what this means. My ex and i have been in an off and on relationship. The last time the relationship ended I didn NOT take it well. I cried, called, begged and did everything to get him back. Now this time around we have almost been broke up for 4 months now. A few wks into the break up he asked if we could be friends. Since he literally destroyed me I told him no. Every since I told him no and did not respond or try to run after him he would act like I did not exist. He pretty much would ignore etc. We have to see each other because we have a son together.

Now all of a sudden I have noticed that he tries to make conversation with and is being 'nice.' It's almost as if he is trying to show me how responsible he is when it comes to our son. What usually causes a guy to go from treating you like you are NOTHING to starting conversation etc.
What does it mean if your ex starts being nice to you all of a sudden?
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