Is this girl playing games with my boyfriend?

We've been going out for about 10 months, and they were friends. Apparently when she first found out about me she started acting like she was interested in him, and had been playing hot and cold (which his friends even said). Then she made a very judgmental comment about me, despite the fact that she's never met or spoke to me, and even wrote a thinly-veiled dig about me on facebook, not including my name but I could tell instantly it was aimed at me. He had liked her for a long time before he met me, so I found it quite difficult initially. So my boyfriend thought for over a month that she liked him, but then apparently she acted like she was happy for us, and it was all ok. She was then single, and I noticed for a period of around 1 month after she was single that she seemed to be talking to him all of the time/flirting. We went away for 10 days on holiday and she was texting him a lot like when are you back, I want to see you etc. and then texting him in the early hours of the morning, said finally we'll see each other, etc. which I thought was a bit much when we had gone on holiday, and giving him little names constantly. After all they were supposed to meet, then she just didn't turn up because it sounded like a better offer was there for her. Then he saw her again, and after that, relocated to be nearer to me, having found a job near me. Funnily, as soon as he moved from their area, she completely stopped talking to him, and she said nothing to him for months. He went back for a holiday, and she asked him to meet up with her, and then ignored him when he said yes. She still doesn't talk to him, and he sent her a facebook msg one day asking how she was doing, and she said she was too busy for any sort of social plans but she'd contact him soon, then contradicted herself by uploading all these photos of her and her other friends out at parties and stuff, events she was going to etc. That was a couple of months ago and she's never spoken to him since. He's given up on her and says he is not interested at all in being her friend, and he doesn't really miss her/they grew apart etc. I have never actually met her like I said, but I know what she looks like, and she knows how I look, and she actually passed me in the car the other day and gave me a dirty look. I just do not understand this girl at all. Does it sound like she liked him? I cannot explain her hot and cold behaviour. I know he liked her for years, and he said she was a good friend, when we first got together, and with all this stuff that she liked him too, I found it quite hard, but I trusted him not to cheat etc. Should I tell him how I felt?

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