How do you say "We need to go on a break" without sounding like Rachel?

[PuddleDuk]

Found out last weekend that DP has been looking on dating sites. He came up with a shit excuse but the truth is he has joined 3 different sites (only admitted to two but I'm computer savvy and know he joined the other one too, even if it was deleted from the history!). I have loads on my mind right now, exams, 40hr week placements, the kids - I just cannot be arsed with this right now. It's not the first time he's lied or done something like this.
So anyway he's coming to take me for lunch today where I said we would talk things over. I don't know what I want right now but I do know I need a break from him.
My question is, how do I say "we need to go on a break" without sounding like an episode of friends?
I just want space really and if he wants to use that "space" to look for another mug woman that's fine with me.

So how do I word this? I'm really trying to say "I don't really care what you do for the next 6 weeks or so whilst I'm on placement but I don't want to see you".

You do it using only "I" statements.

And if you mean it, you're the one who moves out - even if it's not "fair" - because it is the best solution for you (do you live together? If you don't, easy peasy)

For example: "I am hurt and appalled by the fact that you sighed up to 3 dating sites, because to me that is unacceptable behaviour. I am moving out/I don't want any more contact with you [for x amount of time]. If my feelings change, I will be in touch. Goodbye."

But frankly, why not just end it? His behaviour is unacceptable. Isn't this "break" you want just time for you to gear up to ending it completely?

Do you actually want "a break" or do you want to "break up"?

If you'd be fine with him finding someone else during the "break" then how is it different?

We don't live together. I suppose I do want to break up but don't want to deal with that right now so thought it would be easier (and he would accept it better) if I called it "a break"

Grasp the nettle, sweetheart.

(and don't let him talk you out of taking the action that is right for you. A man who will sign up to 3 dating sites while in a relationship must have one hell of a skewed sense of entitlement...)

Just break up with him. He's behaved totally unacceptably - why does he deserve the possibility of a second chance?

And what will you do if he does find someone else - you'll be breaking up then anyway won't you?

Life is too short to dither on things like this. Break up with him, properly. After all, f he's truly sorry and penitent you can still get back together. But I bet he isn't, so you're better off without him, starting now.

Just break up with him, and tell him you've no mental space to deal with a drama over it, you just don't want to see him any longer.