I would keep holding it if I were you, but use a trailing stop.
1) What are the chances of the XLF re-visiting and testing old lows?
2) What are the chances that the top 3 holdings in the XLF will re-visit the old lows?
3) WFC, JPM and BAC make up about 20% of the XLF. JPM is scraping up against a certain short term trend line. WFC and BAC are through those trend lines. Just looking at the charts, common sense tells you that they should visit the lows.
4) Holding over the weekend in an etf like this is never a good idea. JPM might bounce off that line. Its your choice to make...I say that once the trend line is broken on JPM then it will be a matter of days before the FAZ doubles or triples...