give me your opinion on this please?

[myat]

so i dated this guy during my freshman year and my parents didnt like it so we broke of and i had to move cuz my dads job. then like two weeks later my "best friend" tells me that she was going out with him for 3 years already. im a high school graduate already and she has lied to me about this matter for 3 years. i asked her about it and she would say no and also she knew i liked him for another year after i moved. also the ex knowing that i didnt know about the relationship would come see me and we would go on dates and stuff. now that i know about the relationship, i told my friend about him coming to see me and stuff and they both made it sound like it was my fault. they never really apologized and she continuing to see the guy. also im gonna dorm with her in the fall please give me some advice

PS. im totally over the guy. we stop "seeing" each because i lost my interest in him and he got mad at me when i asked my current bf out and called me shallow