Wednesday night was the walk...
Barry is lying about being in an intimate relationship now. Not a stretch to imagine he was lying about one then.
If Barry went out to check on the dear and met her at the dumpster, their prayer circle might've been interrupted by the cleaning lady and that's why Barry questioned her. We weren't doin' nuthin'.
The very next day Suzanne said she was done.
If that cleaning lady later encountered Mrs R and mentioned meeting Barry and his wife and then Mrs R related that to Suzanne, Suzanne would know whether she'd been on a walk with Barry.... and if she knew she hadn't, that would be all the evidence she needed. Lied about the deer, lied about the zipper....and now she had proof.
Now it's possible it was Real Suzanne with Barry...
But considering Barry himself said he met his current paramour at the dumpster...
And Suzanne had said the last few days had been magical...
I'm not seeing a walk with Barry 'round the neighborhood dumpster to be any kind of magic, not for Suzanne, who was preparing to walk away from him.
JMO