Need help to understand my ex?

I went out with my ex before xmas and things did not end so well.A few weeks ago she texed me saying sorry and that it was all her fault.So since then she has been texing and we have hung out 5 times over the past two weeks.So me and her made plans to go clubbing this friday and we have got a hotel room for the night as well for some fun later.What i dont get is when she phoned me the other day she said ill just get a few guys numbers and i just want themn to say how good i look and then on her facebook she just put The y dress and killer heels are ready for friday night lock up your men ladies.I dont get it cos last night she texed that she missed me,i mean i know im not her man and we agreed we both wanted fun and nothing else,but i want to go out and have fun and not watch and not look like a ******* lemon while she chats up.Is this trying to get me jealous or maybe im over reacting a little and should i chat to her about it?