It's Not An Easy Decision

Caught my wife dildo fucking herself in our lounge, whilst on a video call with a guy.
I could see him on her lap top stroking his huge cock, as they both described what they'd like to do with each other.
When he asked my wife to slide the dildo up her arse, she just did it. Something she'd never let me do, fuck her arse.

From some of the things they were saying, it was clear they'd obviously fucked and by the sounds of it, there was nothing my wife hadn't done with the guy.
The whole time I watched, I didn't once get jealous, but instead became increasingly turned on.

When my wife had a massive anal orgasm crying out how much she wanted the guys cock inside of her, I found myself cumming in my trousers.
It was the first time in my life I'd ever cum like that, and it felt utterly wonderful.

I sneaked back out of our home, got in my car and the got out, slamming my car door, then noisily entered the house. Usually I'd have walked straight into the lounge but instead I went into the kitchen. When my wife joined me, she looked flushed, but was composed and dressed.

She kissed me and asked what the stain was in the front of my trousers. I told her I'd just spilt some water down myself. But even I could smell the cum in my pants.
She didn't press the matter though, so I went and got changed upstairs.
By the time I'd gotten back down my wife was preparing our evening meal.

That night in bed I became ultra turned on thinking of my wife masturbating and imagining the guy fucking her. Not giving my wife an option, I fucked her as I spooned her and even slid my cock partially up her arse at one point. She didn't stop me, but did move a little so my cock slid back into her pussy.
She seemed surprised by my spontaneous sexual desire, but from what I could tell when she climaxed, just before me, my wife enjoyed the sex.

Since I caught my wife several weeks ago, I've fucked her quite a few times with no advance hint of sex. She's getting a little more into it, and has even allowed me to fuck her anally.
I know for sure she's still fucking the other guy, because I could clearly taste his cum when I tongued her pussy and clit a few days ago.

I'm not sure what to do next. I'm really enjoying our relationships right now, and still getting off on her having an affair. Yet I'd also actually like to be there, maybe, when her lover is fucking her.
I've not decided what to do. Let her have her secret lover and carry on fucking her whenever and however I want. Or let her know I know and have her invite the guy around.