I am so sorry to hear that. It was very immature how your ex is handling this, throwing you out of the house at 3am after spending a night with your son. Did you find somewhere else safe to stay? That is really important, and if did try not to let her know where. Clearly that is not a safe place for you anymore, go back with someone, if she tries to deny you access to your property in anyway, call the police, she can't do that too you and it adds more security for yourself.