Ex-girlfriend in a quick rebound, was possibly unfaithful, am I wrong to be upset?

My ex girlfriend and I had been dating for a little over a year. Things were great for 11 of the 12 months but the final month there were problems mainly due to the fact that I’m in my last year of university and she’s working in the real world. She always wanted to see me but I’m in the busiest semester of my life and couldn’t see her all the time, I was seeing her 3-4 days a week but this wasn’t good enough. Also important was the fact that she hated her job and was a really miserable person to be around. I had hoped that after this semester things would get better because I would be a lot more available but she broke up with me the day after our one year anniversary. This really hurt because I had just spent a lot of time and a lot of money planning our one year and I was still very much in love with her but I didn’t fight the breakup because a part of me knew she had issues she needed to work out. When she broke up with me she told me that she didn’t feel like herself anymore and needed to go find herself. I asked her straight up if there was anybody else and she said no, she said to had to deal with herself and was not even thinking of being in a relationship anytime soon. She also said she wanted to be friends and I said we’ll see.

Three weeks later I find out through a mutual friend that she’s in a relationship with someone, a old friend that she that we had a fight over because she gave him her number just to “catch up” and he was contacting her all the time. Needless to say this hurt lol. So I sent her a text, stupid I know but this was my first time contacting her, telling her how disrespectful and insensitive she’s acting and that I suspected something must have been going on between them while we were dating. She sent me a long email telling me how upset she is with me for jumping to conclusions. She said when she met this guy she admits she was interested in him and felt that if that was the case then we shouldn’t be together. She broke it off with me and met up with him at a party two days later, “hit it off” and now they’re together. She then blames me for not seeing her enough during the last month and causing me to make her fall out of love with me.

My issue is that she didn’t respect me enough to tell me truth when she broke it off with me, after being together a year I thought they very least I was entitled to was the truth. Secondly I can even believe her when she said she didn't cheat on me if she lied about the other guy in the firs place? To find out through mutual friends that she is already dating someone was embarrassing and hurtful. I feel like a huge joke because I bought all the stuff she said at the break up and was even sticking up for her in front of my friends. And it kills me that she doesn’t think she did anything wrong. Am I wrong to be upset? Is this all somehow my fault and was she right to do this?

Updates:
+1 y
thanks for the replies guys...sumina - I agree with you that I was a bit naive, it was my first serious relationship

always hopeful - thanks man, I already cut contact with her, and told her I'm not going to be friends with someone who disrespected me
Ex-girlfriend in a quick rebound, was possibly unfaithful, am I wrong to be upset?
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