I did know he had seen prostitutes before we got together
He wouldn't come near me as soon as he knew I was pregnant.
He has always been trying to get back together and over the last month or so I have been considering it.
If you consider reuniting again, urge him to seek therapy to deal with what may be a form of 'madonna & whore' fixation about women, or he may be addicted to walking on the wild side. It isn't uncommon and can be successfully treated.
I feel guilty that I have had a dd with him and subjected her to him as a father.
There's no need for you to feel guilty and there's no reason to suppose that his prediliction will in any way adversely affect your dd.
Feel very stupid and deceived
Of course you do - it's an entirely natural reaction when we discover that we have been duped. It often happens that we then feel angry with the deceiver, but the anger we feel is often with ourselves for having been so stupid!
When you move into you new home with dd, try to put as much as you can of the negative parts of your relationship with your dp behind you and move into a future that is bright with hope.
As a precaution, vist a STD clinic for reassurance about your sexual health.