Can I say "hey sexy", even if we are not dating?

Guys, I am not dating the guy in question, but when he texts me I feel the urge to say something to the effect of "Hey babe!", "hey sexy", "hey wonderful!", etcccc (you know what I mean)

1. Is that too girly?

2. Is that inappropriate if I'm not your exclusive girlfriend?

Updates
+1 y
***This particular guy is someone who I have adored for the majority of my life. We are not exclusively dating due to distance, but when we are together we can't get enough of each other! He is just very "mysterious"! I can never tell how he is feeling***
Updates
+1 y
...so I can never determine how he will react to things. I just don't know if its a good idea lol
Can I say "hey sexy", even if we are not dating?
Post Opinion