Here's a vote for you, cause I too wasn't really bothered by it. When Carol showed up and asked if they could be friends again I just took at as, "Sure, whatever you want, making out, busy." So Carol just lucked out that Jess was in a half broken state, and could not care about anything in the world than to be with her new man. That's very in line with the Jess we have seen throughout this run. She's very much effected by her current mood. She can be kind of unpredictable in that way, which is what makes her character fun to read.