Honestly that's kind of a shady thing to do and if you really care for her, you shouldn't get back with her. Accept your mistake and just try to better your self dude, you shouldn't play with people's feelings like that.
Brother, if you plan on getting back with this girl then you need to tell her the truth about what happened. If you truly care about her then honesty is the key. Personally I do not think it is fair for you to get back with her because you have already chosen someone over once and I am sure she was hurt from your break up. It would not be fair for her to get back with you if the same thing is going to happen
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