I don't know mate, inviting ML over to your house, sizing up a friend of your missus circle of friends as a potential fuckbuddy? It feels like you want to be caught. Or at least the thrill of being caught is something you're chasing.

My 2cents,

I'd take a serious look at the state of your current relationship. You obviously don't want to be there. But you're fucking around in other backyards to distract yourself from the pain of a breakup. I've punted while in relationships, so I'm not throwing any moral judgements. I was after sexual connection and satisfaction. ML/WL's know the score and aren't going to pursue emotional relationships, (the kind where they turn up to your house or message your missus). If you need to be single and play the field to be happy then why not have at it? Spin some plates and bask in all the drama that comes with it.

Ask yourself how much mental bandwidth this chick is taking up in your mind from one flirty conversation.