So I come home from being away to find my ex talking to this girl who is the complete polar opposite of me, immature, and has almost nothing in common with him. She is pretty, but she looks like she is five. Why would he be doing this? Is he lieing to himself; trying to keep his mind off me by being with someone like her? Do you think he's aware that I am aware of this and doing this to make me angry? She is also extremely bubbly and that is very strange for him to be into a girl like this.