I get it. I do. This being AIBU, a number of posters will be invested in not getting it so they can be properly scandalised.
These are all things that you did, sort of, but when described in a certain way - presumably the way ex sees it - they sound a whole lot worse. My XH was a master at that.
I came home from work one time on a hot day, my tights had split so I felt horribly uncomfortable, I'd undone just one button on my polo shirt (informal office wear! But it was quite a smart one!). He picked me up at the station with three of the DC and told me we had to go and fetch the 4th from some activity instead of going home (argh), and then just sat at the wheel with this absolutely filthy expression. Turned out that apparently when you're hot, bothered and limping a little with chafed thighs there is Only One Explanation. Women only get hot and bothered when they have been having rough sex. And an undone top button (through which you could just about detect a glimpse of collar-bone) pretty much clinched it. Tosser.
When we were getting divorced my solicitor recommended I try and sort the debt position out first. We went to the CAB for some advice. On the way out XH told the CAB man "I didn't want the divorce, but it's my wife, she likes these young men you see". CAB man didn't know where to look. (We didn't get the debt sorted out. XH wouldn't agree to a mortgage because he said I would deliberately default on it.)
Then during the first hearing in court XH's solicitor came into the room to negotiate with my solicitor, took one look at me and said in sceptical tones, "This is the woman with 200 lovers?" "Chance would be a fine thing," I responded with spirit. My solicitor said hastily "My client did not just say that."
Point being, anyone who actually knew me or even looked at me knew this was utter rubbish, but it seems my husband of 25 years and father of my 4 children did not know me at all.
He passed me over his bundle of "evidence" one time so I could see the information he had been collecting on me since even before we got married: old envelopes and bits of notebook he'd scribbled on whenever he thought I'd said or done something particularly heinous. It made my head spin. I put it down and wandered off to do something else, then apparently it disappeared and of course I must have destroyed it so he couldn't use it in court. Believe me, I'd have loved him to try...
Oh, where were we? Yes, your ex, not mine. Frankly I'd have ditched him for the weed stunt alone. You are so well rid.