Many traders fall in love with just a stock or two and look for opportunities to trade in those stocks only ignoring the other profitable trading opportunities.
It is because they have simply fallen in love with a stock to trade with. Such tendencies can be suicidal as for as trading is concerned.
It must be kept in mind that market does not care what you think.
It does what it does and when you are wrong you are wrong! The easiest way to keep a bad trade from going really bad is to determine before you get in, where you will get out.
Good luck and safe trading