Cosmo magazine came up with the 3 fears that keep you single and in that lonely rut ...

Fear #1: Fear of Being Single Forever 
Though this feeling is only temporary, many of us feel like our lonely ruts have no end in sight. One of the big problems with this is that a man can sense this despair (and desperation) in you and run for the hills. Try to stay positive and you'll attract a quality person who will love being around you.

Fear #2: Fear of Losing the Guy 
When you start to become afraid that this guy you're making a connection with might leave you, you can start to do some weird things. You might be a completely independent person, but become clingy and possessive if you think your guy wants out. Try to trust that he's with you because he wants to be and keep that line of communication open. That way, if either of you are having second thoughts, you can talk about it instead of checking each other's cell phone histories and forbidding him to leave the house.

Fear #3: Fear He'll Turn Out Like Your Ex 
This one doesn't take a lot of explaining. If you've come out a bad relationship, make sure you take a little break from dating. That way, you're not tempted to see the new man you start dating with the filter of the old emotions and patterns that were going on with your ex.