OWW I would get the story so you know what is going on (if that really is the truth) and then go back to no contact. Nothing whatsoever to be gained by it, except to disturb you.
How did you find out about the other two supposedly existing kids? it may be worthwhile doing your own research to be sure of the actual facts, although as you say the CSA can sort the question of how many kids he really does have. It does sound odd, if he already had two additional kids then your payments for your DC would have already reduced. It would be useful to know to work out what you need to do financially and tell your DC the facts but beyond that, there is nothing else you can do except keep him on the far side of fuck.
My head is trying not to think about it all, I miss him and I keep thinking he is in the other room or something. We spoke last night but he is away visiting his DS at Uni now until Sunday. Being the capable man he is, he had already sent me his diary as soon as he got back from the airport so we could co-ordinate our commitments for the next visit, bless. All without any pressure as he knows I need time to really think about whether the sailing thing is a possibility. This type of thing I really like, it makes life easy.
Ike you don't have to strike him out/block him whatever, just wait a bit and see if he sorts it. If he doesn't, you know for sure he is a dick.
Moan Good luck with meetup man. I like meetups too, not for dating but I do put my make up on 