Im in love with an ex?! Please help me.?

I really dnt kno what 2 do...Basically I havnt been wit my ex since 2009 but she's always really flirty wit me and she tells me all the time that she cares for me alot. in 2010 we had a few intimate encounters but nothing came frm it. I fink about her all the time and I really wana be wit her and make it work but when I told her how I felt I never really got a straight answer even tho all the flirting and things continue...I dnt kno wat to do???