What is difference between b/f and seeing someone from a female perspective?

what is difference between b/f and seeing someone from a female perspective? To a "real men" this shouldn't get in the way of hitting on and wanting a female he desires. Known fact is~ 90% of gf/bf cheat and ~60% spouses cheat. I playfully took a phone of someone who is "seeing someone but doesnt have a b/f" and punched my number to call it and stored it in her phone. She doesnt seem to object by grabbing the phone away from me. Perhaps she deleted it but the fact is she didnt object. So what I am getting at is even they say i have b/f or "seeing someone" i say all "real men" with balls should take a risk and go for what he desires! your thoughts?