We were together for six years and during the past six years, she cheated on me for few times with men. We broke up early last year as she decided that she wanted to be straight, get married and have children in the future. And of course, she was cheating behind my back as well when it happened. During the one year breakup, our friendship had turned sour. Ab out early this year, she broke up with her boyfriend and tried to befriend me again. As a person whom I have known and stayed together for six years, I accept the friendship as I thought that she might have changed. We went out several times and decided to go for a vacation to Bangkok in September this year. I know that she still keeps in touch with her last boyfriend. However, something happened last month. I asked her out for a movie. Tickets had been booked but she texted me the next day that she could not make it as she wanted to rest for the whole day. I was told that she had an eczema on her right foot, that it was badly infected that the doctor advised her to put on a bandage. She proposed to go out for lunch instead. So we went out for lunch. I tried to call her in the evening to check on how is she doing but she did not pick up my phone calls, nor did she reply my texts. Worried that something bad might happen to her, I went to her house again the next day and brought her lunch as I did not want her to move too much due to her foot ache. I waited downstairs and called and texted her so many times but there were no answers. She e-mailed me the next morning, telling how sorry she was as she was not in and she left her cell phone at home. I asked where did she go and she said that she accompanied her roommate to buy few things for her wedding preparation. And I asked her again why didn't she pick up my phone calls the evening after we had our lunch, and she clarified that she did not hear the phone calls. I could smell something fishy here. I had this feeling that she went out with her ex boyfriend that evening and she she said her foot was aching, but she still could go out with her roommate the next day. I insisted her to tell the truth but there was no response until today. What should i do? I guess some people have never changed and I don't even think I could compromise a friendship with her anymore as I am so sick of the way she has been treating me. What should i do?Should i cancel off the vacation?Tickets were bought during a promotion so cannot be refunded. Accommodations have also been paid where both of us share the expenses..