I am very sorry for what you are going through. I am not the best at advice, but I will try my best.
You've begged him to tell you the truth but he won't. You know the truth already. Use that right now. There is little to no chance of him ending things with 'her' if he knows you are waiting around for him, pining for him. He knows he can take his time, and when he is ready to come back (in his own good time) he knows you will be there with open arms. Take that away from him, and REALLY consider why you would want to take him back after treating you so badly, much less walking out on his 1yr old daughter. He knows the pain he is causing you, yet he continues to hurt you so blatantly. Losing someone you love is hard, but being in the hellish limbo you are in now is so much worse. The difference is, you eventually get over losing someone, you heal and move on. With limbo there is no healing, just constant pain.
He is manipulating you by telling you that even if you stop contacting him he will reach you.
It's easier said than done, but please try to stop contacting him, at least for now. It doesn't mean you will never talk to him again, but for now give yourself time to process what has happened. I can tell you this too, I have no idea why you would take him back unless he has a personality transplant, but if that is indeed what you want, the quickest way to make that happen is to disappear, stop contacting him, lay low. He will wonder where the hell you went. Right now, he is getting a huge kick out of seeing your missed calls and texts, what an ego stroke for him.
Have a look at the 180 here and implement it as soon as possible. It isn't meant to be used to get them back, (although it can wake them up) it is used to help you detach and that is exactly what you need to do right now.
If you can't eat be sure to drink plenty of fluids, sips of water, milk. Think about seeing a doctor for something to help you sleep and maybe also anti depressants/anxiety meds.
And also very important, keep reading and posting here for support as much as you need to.
You can and will get through this one way or another.
xx
[This message edited by HURTAGAIN1981 at 7:46 PM, August 21st (Wednesday)]