OP you do keep changing the story.
He was suicidal, when you thought that would make more people agree.
Then he wasnt when people pointed out that's a reason to not have him there.
He was having a hard time. Then depressed, then not depressed just has a alot going on. Then gone to his gp anyway.
He was suicidal, you mention asylum seekers committing suicide. But he isnt suidicidal, ir an an asylum seeker.
You talked about your abuse and how you are now hyper sensitive to putting your children at risk. As part of you talking about managing risk in relation to this, you mention motion detector cameras. Now they are for the pets?
You say you are suicidal often, then not so much.
You started by making out, the kids were trying to control you. The drip the behavioural problems then possible asd.
Do you realise that you son with possible ASD could be badly impacted by this? Do you realise that introducing the child to the man as 'a friend's, then them seeing you holding hands, could be part of the reason they dont like him. If you tell your kids you partner is just a friend, them then seeing that your are lying to them, is going to upset them.
If you havent been seeing someone long enough to introduce them as a partner but introduce them as a friend, you dont then act like a couple around them.
Your kids felt like when he was there you focused solely on him, then may be upset you lie to spend time with him too.
You say you ask your kids opinions on too much. I dont think you listen though.