<human>: Provide a brief overview of the text.

My ex D, and I lived together for 2 years. Everything went well, we got along awesome. D started to act a little strange, and it turns out D was active on dating sites and you know the rest. He hid all Facebook posts and pictures from me so they wouldn't see them etc...

I printed off the evidence, and broke it off and left the house we shared that week. He lived there for 1 month by himself. For the past 2 years the bills would get automatically paid from my account and he would just give me half of that money with half the rent. I got the final bills from the apt complex and the bills got paid automatically. I want him to pay what he owes from that last month he lived there by himself because I don't feel it's fair I pay for him since he was cheating on me. Also, I am 95% sure he will pay what he owes due to past behavior.
I was thinking of sending a Message with something like: "Hey D, the final bills arrived and the total you owe is $ X, I attach a scanned copy of the receipts. Please pay the full amount by the Xth(date) at (my paypal). Thanks!"

Would this be a good way to phrase it? I haven't contacted him in 96 days at all. I have him blocked everywhere, but I thought about unblocking him on Facebook to send this. Any advice on how to handle this?
<bot>: Broke up with cheating ex, how to politely and firmly message him to have him pay for what he owes financially? Have not contacted him in 96 days.