I found a note in his pocket?

So, my partner was/is a PA - I found out his addiction in November, I was doing the laundry about an hour ago & found a note in my partners pocket, on the note was a normal list with words & a small written note on the back saying “ipconfig/flushdns”… I have been using computers since I was 5 and I know every little detail about them, I know that flushing DNS gets rid of the domain visit (but not the history) I have confronted him & HE HAS THE NERVE to say that this WAS NOT HIS HANDWRITING? I could identify my partners body if I had too?! Anyways, long story short, I got my suitcase and started packing to leave.. He then got scared and came upstairs and told me that he did that to clear a link he clicked on from his work group chat in ‘WhatsApp’ he said he got absolutely petrified and wanted to hide all aspects of the link as it was porn, it’s the fact he lied to me over something so little, the fact he thought I was stupid enough to believe it…

Why would he write this on a piece of paper? It’s like he was trying to remember this command??

He said he clicked on it at home, but coincidentally there was a visit on Reddit 4 days ago on chrome but can’t find any history on his browser or his phone or anything, why would he have visited it? I know he’s relapsed and I know he is not telling me the truth.

It’s been over an hour and he’s still denying this, I don’t believe him. There is no evidence to back this. I feel like me discovering my partners porn addiction has only taught him how to be smarter. I think this is my time to go.