DDay was today

I'm 27 and have been married about 18 months. She is 28, 29 in July. We were friends for many years before we got married. No kids, no pets, and a lease which is up at the end of July. Last few months have been really rough between us. She has issues every year around the holidays, and I assumed it was just that all over again. Things did not get back to normal as they usually do. Last night I caught a glimpse of something that pushed me over my usual boundaries, and I went snooping through her computer. I found her list she keeps of partners, with a new name on there. A guy she works with, who started at her work after we were together. The file was last edited 12/28/12 and indicates kissing, oral, and traditional sex. I do not know the frequency, but I do not think it's an ongoing affair. She does not know I know yet, confrontation is planned for her when she gets home from work in about 3 hours. My original inclination was to change the locks, buy some boxes, and have people here ready to help her pack her crap and get out. I've since spoken with my father for some advice, and he cautioned me against doing anything too rash (or illegal). I'm not sure where to go from here. I could be willing to reconcile, but that's going to depend on her. Regardless of where our marriage goes from here, I don't want her in my home for at least a few days. I'm due to house sit for my mother next week, starting Sunday. What can I say or do to get her to be willing to leave until then? Any advice for the confrontation? I don't even know what else to say.

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