My girlfriend cheated on me and then left me

I seek for some advice becouse I really feel desperate, angry, broken hearted and ashamed. I was with my girlfriend for 9 years and I went with her trough a lot. We started when she was in college so at the time we have seen each oter only during weekends, then she finished college and went to work (practice), she worked all day long so again we have seen each other only during weekends. Then she had master tests for her law degree and studied all day long and again we have seen each other only during weekends. In the last year she got the job in court and finally we have thoughts on settling in our own place. We argued over where to settle. Both of us had a real estate and we didnt come to an agreement weather she would move in with me or if I would move in with her. She didnt want to hear my reasons (our job was 20km nearer and I have a single mother who I would have left alone). Her reasons were that her home is where her heart is. This wasnt our only problem in the last couple of months I kind of took her for granted and rejected a couple of walks with her, trips to the swimming pool and a dinner with her family. In the last month she said she had work issues and we didnt see each other at all. I wasnt suspicious because I fully trusted her after 9 years. In the last week she said that she is going to a job trip to a foreign country. Thats when I started to doubt (a week long job trip is unlike to happen) so I went near her job place and busted her there (she was alone). I went crazy and said how could she have done that to me after 9 years, she said that things were not going well and that she needs some time and that the problems listed above are the reason. Other than that she said that she have changed and its not my fault. I asked her if she has another guy and she denaid that. After this happened I found out trough her billing accounts that she was more on a pleasent trip that on a job trip....she bought lingerie one day before going on "vacation" and spent the other days in shopping malls. Other than that she paid for the highway (seems like splitting costs). Other then that I saw that she was on a couple of dinners in the month that we havent seen each other. After all this the reason tells me she was cheating on me for a month without telling me anything and seeking excuses. I am destroyed and I am desperate....I feel hurt and angry and lost. I stood by her side for 9 years even when she fell ill for epilepsy, I helped her with everything she needed, loved her and stood loyal to her all those years overseeing her flaws just because I tought she was a good person. The tought of her being in a bed with another man is destroying me. Please help me with some advice how to get over this.