RELATIONSHIP ISSUES, need female advice... HELP?!?

ok... so heres the deal... i've been with this girl for over a year now... and i often catch her texting, and emailing guys.. like, im not that much of a jealous person, but i overlooked one of her messeges to these guys that read."Well thats hot, so, when are we hanging out?".. she then hid the phone so i wouldent see what i already saw... but i dident say anything.. i work full time now and she has one year of school left, so i only see her like 3 times a week... is she cheating on me..? what should i do?We talked on the phone just now, and i asked her about it... she said not to worry about it, and got angry, then kept hanging up... after calling her over and over, she answerd and told me before i could say anything, that she has cheated on me several times with my.. well.. old best friend now... he lives across the street from me... after telling me this, she said sorry and hung up.. i havent gained the will to call again... what should i do... i hate her right now... but she is the only girl i have ever loved...

It sounds like she is....why would she have to hide anything at all? If someone is hiding anything then they mostly are cheating or"talking"to other guys. Be careful....keep your eyes open!