Should I be worried? My boyfriend was texting another girl.

So the other night, I went snooping through my boyfriends phone. I know it's wrong but I did it. I happen to stumble across a text convo where he was... Show More

Updates:
No, not an overnight trip. Just a day trip for few hours. We had a disagreement that I knew upset him because of something I had said. But we weren't in a fight. Were still together, in fact we've been doing very well. But last night while he was asleep I looked at his phone. But I'm just so confused at the fact he'd call her a pet name like that, then ask her if she was free to hang out this week and suggest her going out with him.