Sounds like things are kind of overwhelming right now. Keep in mind that Kristal has her own inner resources too, so maybe ask yourself if it is necessary for you to be texting her every few minutes? It's nice that you want to help her and that you keep in touch with her.
About the man (Chris) - maybe consider if it is helpful or not for you to say anything to him about his past? When you say things to him, perhaps this sounds like criticism, and he then might react to this. I would try to keep more distance from him. And stick to your explanation that your business is your business (it is not for him to get involved). Hopefully Dot will stop talking about you (to him) - so let her know that this is inappropriate.