Did I screw things up or should I try again ?

wow... well look here. if you are able to make contact with her ask your self this first. what if she's with someone else now? how will you handle that answer? i mean you'll never know if you don't ask but sometimes what we want isn't always what we need. i think you had every right to bring the fact up that you knew about the other guy. it should've been established then that the two of you would be up front and open about things from then on. that's just me though. can't blame you for being a lil gun shy when it came to her moving back to her parents. all i can say is that you may want to think twice about contacting her and if you do, be ready for the worse. good luck