From this article, it is clear that Buddhism accepts(but doesn't really root for it) divorce when things get worse. But, how is marriage after divorce looked upon?
As not learning from your mistake.
Just kidding. :)
No problem at all. From the same article mentioned:
The Buddhist views on marriage are very liberal: in Buddhism, marriage is regarded entirely as personal and individual concern, and not as a religious duty. There are no religious laws in Buddhism compelling a person to be married, to remain as a bachelor or to lead a life of total chastity. It is not laid down anywhere that Buddhists must produce children or regulate the number of children that they produce. Buddhism allows each individual the freedom to decide for himself all the issues pertaining to marriage.
Although this is the author's interpretation or opinion, I didn't find anywhere in the article that mentioned that remarrying is looked down upon. I don't know of any teachings related to this either.