Advice pleasee!

My son in 9 months old, his dad has never met him. At approx 5 months old we had DNA tests to confirm he was the father. He hasn't messaged me or anything, he has blocked me on Facebook though. I didn't realize he was seeing a girl at the time i was sleeping with him (they werent offical at that point but a few weeks later they were) i think that is a big reason he is trying to avoid being a father, because he has to tell his girlfriend he cheated. I want my son to know who his father is and i think the dad needs to meet him before choosing he wants nothing to do with him. I messaged him about 2 months ago but never got a reply, i was thinking about waiting until my sons first birthday and seeing if he will meet him then. What would you do in this situation though?