Why am I so sad right now since my dad left.

Like so sad.

I fear his safety but I really shouldn’t I don’t think. Everyone tells me he’s fine and doing fine. Fiancé sees him at work everyday. My sister says he’s fine. But I lived with him for 10 years and not anymore. I’ve seen him go through his alcohol usage. And when he comes over now he doesn’t talk much since I moved out. Like he’s shy or something idk. Makes me very very sad. Like I want to be back with him.