<human>: I'm going to (try to) keep this short as I am really just looking for an objective opinion. This type of situation has happened a few times now and I am not sure how I should feel about it or react. Below is just one minor example. 

I went out with my girlfriend last night and she had mentioned that her flatmates had asked if she wanted to go for a run early this morning. Last night she said to me that she wouldn't like to as she was tired and it was too early etc. So I decided to stay the night at her place. 

This morning her flatmate wakes us both up and asks her again, she says no to him and gets back into bed, telling me how it's too early etc. Then she says "maybe I should go" and gets up. Now I have no problem with her changing her mind, but I'm confused as to why she told me so clearly she wouldn't like to go. I then ask if she's sure she wants to go considering what she's said to me previously. She takes this to mean that I am jealous of her spending time with friends and gets angry at me. 

Ultimately, whether it's running in the morning or saying she doesn't want to drink to me and then drinking with her flatmates, I just feel confused and a little hurt. 

Am I entitled to feel like she lied to me and that she is only doing these things because of peer pressure? It upsets me that she seems to do things she doesn't want to do, just because one of her friends asks her to several times.

Give me the gist of the text in a nutshell
<bot>: My girlfriend will say one thing to me in private and then once she is around other people she 'changes her mind'. Am I right to be upset and  feel like she's lied to me?