Is Claire's and Dylan's relationship healthy?

Right from the beginning to the very end of the book, it's very evident that Claire is not happy by being in a relationship with Daryl. She's always complaining about him coming home late and just the way she talked about him, it gave me the impression that she doesn't really know why shes in this relationship. There doesn't seem to be any love between them. It seems like they hardly talk-- it doesn't even seem like he's content with her because he's always going out to strip clubs to get lap dances. Claire is not happy that he gets lap dances but she also never brings it up with him. Why is she staying in this relationship with him? It seems like there are more negatives than there are positives. There must be an important reason as to why she's with him. Do you think she really loves him or do you think that shes just with him because shes scared she wont find anyone else? Does he love her? If he does then why does he go out to strip clubs when he has a girlfriend?