Why do Leos like me so much?

A lot of Leo girls, and even a few Leo guys hit on me frequently. Some times they are just really nice to me without any sexual intentions. Every time some one flirts with me, or offers me something for free, or ask me to friend them on facebook, or sit next to them, I ask them their birthdays and they are always leos. The problem is leos tend to be, well, too flirty, aggressive, and extroverted for me. I mean I'm a Cancer guy. I am very shy and reserved and gentle. I never raise my voice in public, I am never vulgar, I dress very modestly (I don't believe that clothes should define someone), and I am somewhat mellow (well at least in public, at home I tend to perk up). I would think I would be to boring for a leo, yet they always gravitate towards me. So, why are Leos even attracted to me in the first place as I don't have any of their extroverted tendencies. I don't even reciprocate when they flirt with me (they tend to come on too strong, and it kind of scares me). I usually just look at them sweetly and smile bashfully until I can scuttle away. The only thing we have in common is that we're both really sensitive, except cancers don't show their sensitives side in public much, where as a leo is quick to fight or cry if they feel insulted. So again why do Leos like me so much?