Mentally exhausted?

So I have been split up from my Significant other since June. (Cheaters deserve to be stoned to death btw) My 10 year relationship with her was extremely toxic. I worked a lot to try to make ends meet but was necessary for survival. We have 2 children together that makes things difficult.
She cheated in 2012, I took her back... crap started again April of this year. I divorced her. My big questions are... Why am I still in love with her? She moved on and seems happy. Why is she not remorseful for her actions? How do I move on? What should I do to get over her? Any real advice is appreciated, thank you!
Mentally exhausted?
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