Hello there.  Pardon me if I take a bit of a time to get the facts straight!.  Am I right in thinking he was honest with you about his illness but you could not or would not believe it until you got some evidence.  Why would you think he would lie to you about this?    Forgive me if this sounds critical but it is a bit confusing!  So you moved in together - you were in denial about his illness then you became doubtful about everything - not sure what he had done to make you doubtful - and you returned to your ex who for whatever reason hated him.  So are you now back with your boyfriend with terminal cancer.  Why are you so sure you would have been having his baby shortly.  I really do want to be helpful but it is a bit difficult to follow things. 

I think the basic thing is why did you not believe he had cancer. I realise you were upset when you wrote this and may have missed out a few things .  If I have got this right you are back together now - the hating ex has gone?  And you now want to care for your boyfriend?  Is he upset about your inability to accept he was ill?   Are you the only person caring for him - does he have any family? 

If I have got at least some of the facts straight then he has not been dishonest but it was you who called off the relationship.  If this is the case then all you can do now is try to make up for the time lost when you could have been together and care for him for as long as he has left.

If your feelings are as confused as I am (!) then you need to slow down and take things as they come.  Your boyfriend deserves a bit of consistency now and hopefully you are providing this.  I hope you are not offended by anything I have said but you have come here to talk to us and I am trying to help; maybe others will do better; I wanted to ensure you had a response.  Annie