Abbas is part of the PLO old guard. He's not interested in what's best for the "palestinians", which is a peaceful & prosperous future. His real intentions are clearly stated in the PLO charter - the destruction of Israel. Negotiations have continued while settlement building has taken place in the past. This is just an excuse for him to avoid making peace with Israel while looking tough before his fellow terrorists. He keeps repeating the same unreasonable demands such as the "right of return" which would flood Israel with arabs & east Jerusalem, which is the holiest place for Jews. He knows these are deal-breakers, so he's obviously not serious about peace.
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: Hamas: Netanyahu emerged triumphant from summit with Obama, Abbas