Quick question if you guys did not exchange numbers how will you talk later? now on to the next thing if you were discussing some business proposal that is good also meaning you can get a place to meet up such as a diner or at one of your homes, first thing i would say to do is try to get her number to contact her do not do it as if you are hitting on her get it and say you are discussing the business proposal and once you guys meet up bring up the past relationship and she might be silent when you bring it up but its a good time for you to apologize even if you do not feel it was your fault