<human>: I started dating a girl, we'll call her Mallory, back in December. We never officially had the girlfriend / boyfriend talk, but she stayed over a lot and we slept together, and it was implicit that we were exclusive.

During this time, however, I kept dating other women, eventually sleeping with one of them. I broke things off with Mallory after about three weeks telling her that I wasn't ready for a relationship.

Recently Mallory got back in touch and wants to start seeing me again. I'm open to this idea and would like to pursue a relationship with her. Should I tell her about the fact that I kept dating other women, and slept with one, the first time we dated? I feel like she has a right to know because my conduct was pretty awful, but then again we did only date for a few weeks the first time round?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Dated a girl for a few weeks, slept with someone else, broke off contact with the girl, she wants to get back with me, should I tell her what I did?