Here is what Handler and 50 said about Ciara
" 50 said he'd warned Chelsea that there might be tension, which didn't sit well with the talk show host. "Wouldn't you want to tell someone that?" he said. "How do you treat that if you had something from your past..." 50 seemed to be trying to thwart any weirdness between Ciara (who 50 claimed still had feelings for him) and Chelsea. Oh well.
On how Ciara played a role in their break-up:
It was revealed previously (by Chelsea) that Chelsea dumped 50 because he called to complain prior to Ciara's appearance on her show and she felt that was very "8th grade." 50 said he felt like he should warn Chelsea that Ciara was still calling him so she would be aware of any tension. Chelsea saw it as being childish and decided to cut ties with him.
Ciara was no side chick and it was 50 being childish. A side chick she is not.