I think my dad might be cheating on my mom.

Hi guys. I just got back to my home state after spending 6 months across the country. I really haven’t been around my family all that much for the past 4 years though. I struggle with addiction. I’ve been in and out of rehabs for the past 2 years, and finally decided it was time to get serious this time and come home. I missed my family more than anything. Anyways, I just returned yesterday, as hopeful as ever, and my youngest brother who has been the only child consistently around my parents for the past 3 years absolutely crushed me today with all I had missed out on. Apparently our parents have been fighting pretty frequently recently. And then I guess the night before my flight home (this past Monday), my parents and said brother all went out to dinner. My mother was sitting across from my father and brother. Since brother was right next to dad, he was able to side eye some of his text conversations, one being with a woman. He didn’t see much, other than her name (no last name), part of the message sent from her-something about “tomorrow” (tomorrow being yesterday) and concluding with “your family doesn’t matter”. His response to that was something along the lines of “I can’t my daughter is flying home tomorrow”. But that is all that was seen. Youngest brother immediately excused himself to go to the gym (how he copes) and was apparently over questioned for leaving by my father once he returned home. When I was told this, being less than 24 hours out of rehab just excited to finally all be together again, I completely broke down and called my middle brother who is away at college. My middle brother is very close to my dad and came quickly to his defense. He did, however, tell me that the woman’s name that was seen is the name of someone who used to work for my dad. He ended up calling my dad, not sure what was said exactly, but when my dad came home from work he was questioning me on what my youngest brother and I talked about today as the middle said “he was acting weird” and “is worried about him.” I, of course, didn’t mention anything other than one of his friends at school is giving him a hard time. My dad responded with “good. I just needed to know what it was about.” About 15 minutes go by, and my dad then asks me how to disable iMessage notifications so “no one at work who just walks into his office will see them.” When the youngest broke the news to me earlier, he had also given me my dad’s passcode to try and check his phone while upstairs or something. I found an opportunity not too long ago, and surely enough, it’s not the same. It used to be 4 digits and is now that long length one. I’m not scared of relapsing if that is where anyone’s mind is at at this point. If anything, I want to be sober now more than ever so I can be there for my baby brother (he’s not dealing well with all of this) and then my mother (my best friend) if this turns out to be true. They’re coming up on over 20 years together. Any advice on how to find the truth (if I approach my dad he’ll just call me crazy either way) or just any advice at all would be much much appreciated. All of these occurrences could be simply coincidence, but I’m at a point where I don’t believe in those anymore. Sorry for the wordiness I just wanted to include every detail I can so y’all know where I am at.

Thank you all in advance. Love and light.