Is he a player? Or has he been in the past? Has he cheated on any of his gf's.
These are the questions I would want to know before giving my heart to a known flirt, yes we Leebs are good at that flirting but there are loyal Leebs or ones that will wander.
And yes find out for sure. It's not the easiest subject to approach but tell him how you feel about him...
Arrr Nef, use to tell me exactly how to say things to a man to get him to listen, without making him feel like he needed to be on the defence. She put me onto Rory Raye

Try this site:
http://blog.havetherelationshipyouwant.com/top-rori-raye-posts/