Hello OP. My H left last year suddenly, I found out I was pregnant a few days after he left. (Subsequently discovered he had been having an affair and got OW pregnant too, but that's a whole different story,...).
Like you I longed for a child. My H also asked me to get rid as in his words 'I can't believe this has come at such a bad time'. He felt it was best 'not to go ahead'. He couldn't actually bring himself to say the word 'abortion' but he got as close to it as he dared. I was distraught that this was his reaction.
I spent the first few weeks of the pregnancy agonising what to do. I even booked a termination date and only decided at the 11th hour that I was going to keep the baby. Having said that, I think I knew, deep down, that I was always going to keep,..... but I just needed that option.
Fast forward a year and I'm typing on my bed as I have my (and he is MINE, ALL MINE!!!) 5 1/2 month little baby boy next to me. My H, who I am currently divorcing, has had nothing to do with the pregnancy and has not seen his son. I am doing it alone and suspect he will have no involvement at all. I won't lie, it's been really hard at times, but already I wouldn't change a thing. My H showed his true colours and I wouldn't want him around anyway.
I recently went on holiday as a single parent with my own parents. It's not how I imagined my life to be at all - but I will never regret my decision to have my lovely little DS. 
If you want to do it, you can. 