I really agree with this.
When his father died the world changed forever.
Your son learned at a very young age that the world is not a safe place, that nothing is forever.
Anxiety and depression are rife among the children/young adults of bereaved children.
Your son had this man in his home through covid and the lockdowns.
How hard must that have been.
He sounds like a bright intuitive boy who rightly doesn't trust this man nor his motives.
Take his suicide attempt very seriously.
It happened after this man moved in.
Your son has lost so much and him moving in and him preventing one on ones with you, was simply too much for him.
This man does not wish your son well.
Should you marry him and anything happen you, he's the type that would turf your son out in weeks.
He has been so brave to tell you the bald truth.
It really is a case of what value you place on his life.
Don't put anymore pressure on him, too much has been placed already.
Make the right decision yourself and tell that man to make alternative arrangements for himself and HIS children, as YOUR child needs HIS home back.
Expect that man to put up a major love bombing guilt trip.
He is not going to want to give up free accommodation and food.
It's not something that he will get easily, and he has put in effort to get through your door.
But he overplayed his hand.
Preventing you from spending one on one with your boy, was a HUGE red flag.
Banging on about him being respected, another.
Your son owes him nothing.
Respect is earned.
He didn't earn it.
He bullied your son and your son quite rightly didn't want to be around him.
You know the finality of death and you know at 18 your son was in so much pain he wanted death to end it.
Don't allow him, through this man and your choices, to find himself in that place again.
You will never forgive yourself for knowing that putting this user ahead of your son, cost him his precious life.
Be brave, and do the right thing.