My girlfriend sometimes puzzles me. today she cancelled a meeting with me and said she has to meet with her friend (who she despises) and her friends bf. apparently she needed to interview him for work. i didn't say anything and spent the time going to the gym and working on car. last week she also wanted me to go with her to friends birthday (she hates them too) but i declined because i thought she didn't really want to go, but she did, so she went without me. she was also very edgy when i was on her phone fixing her sim card issue. i trust her and she's been a very respectful and faithful girl. i'm not sure if i should be concerned but a friend of mine said these are red flags. any suggestions what i should or shouldn't do?