thats sad nikcola
well its just you and your lovely dd against the world then
you can do one of the hardest things that you will ever do and that is to break up with dp when you still love him and whilst your still young be able to move on...the advantage being that your more or less coping on your own anyway (apart from weekends when he comes over) so you know you can do it, and also you have your own place
or you can carry on like this until it all blows up because one day that wife will come over...and you can carry on being with him hoping he will choose you...but you more or less have said that you dont agree with or like the fact he got another woman
also, personally, for the sake of your dd, try not to let her see that this is the way to be treated, break that chain now or she will think its okay for a guy to treat his girl like this
im sure when he is nice, he is lovely, and all is rosy in the garden, but there is a volcano waiting to erupt when the wife comes over
you really need to be strong on this one if you want a different future, but im guessing at the moment you will go along with the way things are because you cant bear to break up with him
what ever you do, you always have the support from the good people of mumsnet