Im in a similar situation myself. DS is 4, has seen his real father a total of 3 times this year, from Jan - feb, kept letting him down.
Due to current family circumstances we moved 200 miles away from DS's father. DS doesnt ask about him, says my new DP is his Daddy Paul, we have another baby one the way and my ds could not be happier.
I do feel sad that his father was such an a$$ who kept letting him down, but after all my efforts he couldnt make a tiny bit of effort at all.
Before we moved, he took me to court to get regular access, he kept it up for 2 weeks, therefore court wasa bit pointless and an unneccasary way of dealing with things. He showed up at his birthday party in April, showering him with gifts, asked him did he want to go with him for a few hours, queue the tears, he didnt go I took him home. If Im remembering rightly this was the last time he saw him.
When we moved I wrote him a lengthy letter, telling him in a nice way how i felt he let ds down, I told him I would be happy for him to book into nearest travel lodge and come and see his son, aswell as I was happy for him to see ds when I went back up to visit my mum. Which isnt very often. He hasnt took me up on any of these, texts me once in a blue moon asking how matthew is. He has our home number and hasnt rung him once.
Im worried about christmas approaching, I know he will get in touch, usually does. The plan was to go to my mums, but unfortunately I cannot travel now due to being high risk.
As far as ds know his dad lives with his new girlf, his nanny and his brother. He doesnt ask him them all. Hes a happy little boy and although the move wasnt to get rid of ex, its certainly helped DS settle because he doesnt have ex flitting in and out of his life as it suits him.
I got so fed up of seeing my little boy sit at home in his coat with his bag packed waiting for his dad to turn up, seeing his tears when he didnt show up. On one incident i rung ex and he nicely informed me he had took his girlf and baby on holiday to blackpool!He uninvited DS to his babys christening,left us stood at the hospital after an hours train journey after Id taken DS to meet his new brother.
Now hes happy, settled and overall an Angel, no swearing or smacking (which he used to do when seeing his dad)
He does still have contact with ex's dad (grandad) who rings us weekly for updates and is coming down to see us at xmas, which I think is lovely. But it was best all round that we moved. I will answer questions truthfully when he asks, I will keep in touch with ex, for when ds is old enough, but I cannot put my son through so much hurt and let down.
sorry it was long. I hope you can decide what to do for the best x x