<human>: Can you condense the text into three sentences or less?

I don't want to go into too much detail, but long story short, I dated this girl I work with (oops). She ended up using me, cheating, and lied to me, in that order. I learned I'm not the only person she's used and tossed like this. Now she has some new guy. I really liked her (and still do) and it sucks. She totally avoids me at work all the time, doesn't talk to me, makes no effort to be friendly, even though I do, but whatever, that's beside the point.

She's training me for a new position at our work tomorrow. It's a one-on-one, five-hour thing. Really sort of up close and personal. I still do like her, even though I know I shouldn't. How do you suggest I act during this training? Should I be friendly, nice, etc.? Keep in mind she's totally cut me off and hasn't talked to me for like a month. What do you guys think?
<bot>: Ex who used me, cheated, and lied to me is training me at work tomorrow. How should I act during the training?