<human>: Can you condense the text into a few key points?

I haven't confronted her about it yet, but earlier today I received a text:

it's not particularly incriminating, right? But I found three things odd:
1.) She never has called my dad "darling", on any occasion. 
2.) My dad, when asked if he asked my mom to get him anything in casual conversation, said he didn't even know she had gone shopping.
3.) When I replied with a simple "what?" she didn't acknowledge it, she simply changed the topic, segue into how she bought some new candy bars.

Normally, I wouldn't even give this type of thing a second thought, but it's the first time I've gotten hard evidence of my long-time suspicions. My brother and I have discussed this before, that we think there may be someone else, but it's all circumstantial, even /if/ we both agree on it.

How we came to the conclusion:
1.) On numerous occasions throughout the last few years, my brother and i have walked past her texting someone only called "Baby" on her phone-- whenever she noticed us hanging around, she'd immediately put it away.
2.) My dad's out of town often for work stuff, and she always spends at least one night elsewhere or comes home usually late and drunk.
3.) She's strangely possessive of her phone and passwords; once, my phone went haywire and I was going out of town for a school trip, she refused to lend me any of her (numerous) phones without any explanation.
4.) When asked where she's going, as my brother tends to do (he's an asker, that one), she only ever replies, "out."

:/ 

I've never expressed this to anyone outside my brother, but she's been acting really weird lately-- I mean strangely nice. She's been treating me quite poorly as of late, and once the message had come into my possession, her entire personality made a 180.

I think that's reason enough for suspicion. What do?
<bot>: received mom's wrong send calling someone darling and getting them smth that costs real $$$, had suspicions of her cheating before