Am I wrong for feeling jealous/left out/hurt by something my girlfriend did (not cheating)?

Apologies in advance for the length of this one... So my girlfriend recently spent her spring break in Florida, where she has a condo, and originally she had wanted me to come down with her. She has a group of girlfriends down there already, but literally a week before break her college roommate booked a flight down and essentially made plans to stay with my girlfriend for a few days. My girlfriend and her roommate, who are best friends, had been having some pretty serious issues, and it got to the point where a few weeks ago my girlfriend told her that she did not want her to come down to Florida with her. This seemingly was forgotten/ignored and what ended up happening was my girlfriend telling me it would be better if I let her do her thing in Florida for break and we'd go down in December when she gets time off from work. All week, she was terrible with her phone, more so than usual, and basically didn't respond to texts at night. She got mad at me and said I wasn't being fair giving her grief for not answering. Now, I wasn't mad that she wasn't responding immediately, rather that she wasn't responding for hours at a time, and three nights I didn't hear from her until the next morning. She's also been telling me what an amazing time she's been having the whole time, and says it was her best spring break ever. Am I wrong for feeling really jealous that she can say that, since I feel like I should have been there with her? It's been really hard to talk to her and listen to her stories because I feel like I should have been there with her, having fun together, and instead I was left out altogether. I can't tell if I'm being unreasonable, selfish, or what...I welcome any opinions (guys or girls). Thanks for any advice given!