Bo talked Carly into it. She kept trying to pull back, and he kept on her like he was a teenager. Does anyone really act like that at their ages? It seems like she would have a clue how he feels when she told him she loved him and he just glazed over and dived back in.
I hope Mia ends up being her daughter, both Mia and Carly are sad and depressing all the time. Melanie at least has a personality.