Don't ask him, hold. Tell him. You need to stop living 'around' him. You need to be an active participant here. Even 'asking' him to leave makes him the active one and you a responder to his reply.
Hold, please, try and see.
Crying? Like he did when you saw the deleted call on his phone? Like he did those other times when he was caught out.
He's fucking pathetic, love. I now you are emotionally affected by him and so probably moved but how many times does he get to pull this shit. The fact you respond emotionally to him makes you less objective to what's going on, not more.
From the outside he seems like a cartoon fucking rat. Like a jack the lad who goes out, does whatever he wants, leaves you with the kids, fucks around a bit, falls for someone else, just does whatever he wants and you just....tend to him. I don't know. Just react. like a sad, put upon mum. And he just doesn't really view you as...real.
Please be wary of what you are feeling. This always comes with a confrontation. It's really really sad that you need to confront him with his own pathetic, cruel, psychopathic lies to feel intimate with this man. The rest of the time, if he had this way, you would be in a cold, unintimate, lie of a marriage in which you questioned yourself all the time, feel the need check up on him behind his back, and feel pathetic and suspicious and ignorant. He's taking you for a fool, hold. I don't take that lightly but he is. Absolutely nothing he has done has any indication he will behave differently in the future. NOTHING. He has behaved exactly the same as every other time he was caught out.
You're not hearing us.
Why on earth are you still looking at it from his point of view? 'I just don't understand why he's jeopardising everything we have...' Don't you see? Because that's what he DOES. He just does whatever he wants. And he wants to stay in touch with OW because he misses her and he likes the ego boost of her contact and her presence in his life and he doesn't really give a shit if that hurts you if you don't know about it blah blah blah. And then he lies to you about it. That's why. Just cos he wants to. Don't you see? And on the odd occasion he is caught out he cries. And you pretty much immediately forgive him and take him back. I'm not saying it's fully conscious but that's what he does. That's who he IS. It's NOT A QUESTION OF YOU UNDERSTANDING WHAT HE's DOING, lovely. That's completely blindingly obvious. It's you starting to understand WHAT YOU'RE DOING.