Should I Accept This?

Okay I want to know what you would think and feel about this if you were me. Me and my girlfriend split up around three months ago after going out for about a year. We were best friends but naturally there is that period of not speaking to each other after we split up (which has been difficult since we are part of the same friendship group). Anyway, before we split up she used to go on about someone at work called Tim. She wasn't obsessed but she would go like 'OhmyGod it was so funny with Tim at work today blahblahblahblah'. I should stress that nothing happened with her and Tim while we were going out. However the other day she wanted to meet up with me before we went to university. Now I was so happy she suggested this because splitting up I could handle, but losing your best friend? That was very difficult for me. So I went along and it went brilliantly. We spoke for like three hours, we were laughing all the time, it was great. It was just how I wanted it to go - no romance but being really good friends. However, while I was there I learnt of her being in a relationship. Now it had been three months, she's good looking and the funniest girl I know so I expected her to probably be in a relationship and it didn't bother me. But it went like this: Her: ....so I can't come tomorrow because I'm going to see someone (I'm thinking okay, she's in a relationship, this is fine). Her: ...It's Tim... (for some reason my internal emotions went absolutely crazy, but I didn't show them). She has been with him for the last two and a half months. How should I feel about this? She mentioned when I met her the other day that she really wanted to be friends again and just by the way she asked it I knew she really wanted too, and so had I. But now I just don't know. I almost feel the reverse. I don't really know if I want to be friends again now. I don't feel anger or sadness but I feel like I've been betrayed. Splitting up with someone to effectively go with someone else is a horrible feeling. Sorry about the length of this thread by the way. Is it right that I feel betrayed? Should I just forget about it and be her friend again?

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