my best friend was in a LTR also, for about 6 years. but one day she found that her bf chated on her. Yes she was hurt, but it's only for a few months (mm...i think it's alittle less than few months actually)..well, afterall she has me as her bestfriend...haha..she soon met another guy, and i can see that she's happy and get over her ex just as immediately. i think you should be honest with ur bf that u cheated on him. when he gets angry, she will get over you extremely soon (especially when he meets someone new), it's alot hurtful to be strung along but u treat him differently, and breaking off saying what i think is unreasonable "want to focus on career". he knows that focusing on career isnt the real reason. he knows it. so when u want to break up, just do it, say what really happens that makes u decide to end it off. he deserves the next girl who wants him just the way he wants her. dont wory, he WILL get over you. and i hope that when u trully in a commited relationship next time, u shouldn't be all upset when the guy ends up breaking it off with u just as u did with ur ex. end of story.