Not pregnancy related but need advice

Okay.. So I'm coming to glow for advice because there's no one I can talk to about this situation without them telling. My mom & dad have been together for 28 years they were married once before but currently aren't married but are still together. They have had a lot of problems in the past and I will admit my dad has a little temper from time to time. Anyways just recently they've been having problems and my mom wants to leave but my dad is doing everything in his power to keep her happy now. My mom thinks its too late, but my dad has honestly changed. She thinks he's too boring and not romantic enough and she likes to go out to bars and stuff..so now my dad is taking dance lessons so he can dance with her when they go out and he's been more spontaneous too. Well just recently I found pictures of my mom and another man on her work phone I confronted her about it and she said that she's been trying to leave but my dad doesn't want her to. She told me not to say anything and I know if I did say something it'd absolutely destroy him and I'm scared he'd drink himself to death or getbbad on drugs and die from it or simething.. He really can't make it without my mom he loves her more than anything and wants to fix this so what do I do???