My H was the same way. The girl he dated before me was my best friend. She was kinda a floozie. She was quite easy if you know what I mean. She hit on my H repeatedly. He was just not into sex w/ just who ever. He broke it off w/ her w/in 2 weeks. It was a very short lived relationship.
It is nice to know such guys still exist. Stay that way, don't let the world change you.