I would tell him you saw them and break up with him. I would have the intention of the break up not being permanent though. Wait till he comes crawling back to you. I don't know though, do what you feel is right for you. Every relationship is different. That is what I would do but I am definitely NOT an expert on relationships! lol. I think if you don't confront him on the text messages it will eat you up, you'll start being bitter and mean and he won't know why. Causing him to pull farther away from you.

Honestly if he's gonna treat you and the baby this way he doesn't deserve to have either of you in his life.. Unless he changes his tone I would kick him to the curb. screw waiting 9 months for him to come around. If he wants you to miscarry how do you know he won't physically harm you when you refuse? "accidentally" trip you down a set of stairs or choke you? my dad did those things to my mom.. and how would you feel if he did do something to you that caused you to lose the baby? you'd never forgive yourself. and if he keeps it up i highly doubt that once the child is old enough to understand he/she would want their father around any way. i mean if he changes his tone by all means he could just be scared. but are you willing to bet your baby's life on it?