struggling to let it go :(

This might be a long read, but I genuinely need advice. Firstly, i'm in a LDR (she's in NY while i'm in London). We were together for 9 months, and she ended it. Basically, she felt I didn't care about her. She stated that it had been 9 months, yet we'd only seen each other once, and that was when she made the effort to see me (despite the fact that she has College tuition to pay for..so it was very commendable and i'm extremely grateful that she did). I was unable to visit her as i'm in my final year of A-levels and as a result, my Mum was not willing to let me go. However, she eventually came around (post break-up) and let me visit (this was with money i'd earned via a part-time job btw). Now, here's the issue... A few days after breaking up with me, she hooked up with some guy at her university ;( it killed me...at first I thought it was strictly kissing, but it turns out that there was also oral sex involved. However, I love and care about her alot, and decided to exhibit nothing but compassion and forgiveness towards her. Recently, I went to New York to visit her and it was absolutely amazing. I had a great time, as did she. In addition to this, she's coming to London for a semester in September. However, I can't seem to get this image out of my head ;( I mean, I want to let it go, but I just can't for some reason. The thought of her doing those things with another guy kills me..but, she tells me that it wasn't her (and I don't think it was)..they weren't her true colours. I mean, she came all the way to see me despite the fact that she has college tuition fees to pay for (largely by herself as her parents don't have the financial means to support her). Maybe i'm being selfish? I don't know..she's a good person. I do love her, and i'm convinced she loves me. She didn't cheat once during the 9 months we were together. She says that she was just hurt as she felt that I didn't care, and i'm really trying to look at things from her perspective and be understanding. I'm just unsure of how to get this thought out of my head? Should I even be angry about this, considering all she's done for me? How do I let it go? ;( thank you so much for reading

Put the internet to work for you. via Personal Recipe 2629979