Cheating boyfriend.

Okayy..
Well me and my boyfriend have been together for like a year and a half now.
And before we started going out, he was a big player.
I knew that.
But we just liked eachother so much.
I still went out with him./

But now I find out that he has...

been cheating on me, with one girl about 2 times.

I don't know what to do.
I mean we have been through so much, we had a baby together, and we put it up for adoption, to a lovely family, because both of us arn't ready to be parents.

I knew he was a player when we started going out soo I am shocked, but that thought of that happening had crossed my mind.

He said he is very sorry and all that.
And he loves me and can't not be with me.

What do you think??
Do I stay with him or??

its up to you really
if hes really sorry and didnt mean for it to happen you could stay
but then again to cheat on you twice with the same person isnt good
he should know not to cheat
have a talk to him about it, about why he cheated, how you feel about it, ect
but know that theres really only two things you can do if you stay with him
you can accept it, realise it was a mistake and forgive him
or say you forgive him but never really accept it, which could make problems worse if you bring it up a lot a later on and loose trust in him
on the other hand, if hes a player, I doubt he would change
so ask him wether or not he wants to be in a relationship and wants to make a commitment to you

this isn't being hypothetical again, is it?