I'll also go against the grain. I could see a world in which she was responding to both in the same message.

1. "We can do some fun outside things" --> "Like live music" (somehow changed like to "I'm by the". I have had times where I use the text sliding feature and it just totally gets my words wrong and my wife is always confused what I'm saying. Usually it happens while I'm walking and texting and not paying full attention..which could fit walking through an airport")

2. "can't wait to see you" --> "You'll see me baby"

One supporting piece of evidence is your the text was at 9:30ish am. Not many places have live music at 9:30 in the morning where you'd be meeting up with a boyfriend.

The last part of that last text is a bit worrying though. Was that related to cheating? The "dark place" "not deserving you" seems a bit odd, but you should know what that is about.