Such fine language...
No it doesnt boil down to the way u've been brought up, bcos I know that my own circle of friends have become entangled with such matters, start off as friends, gravitate towards something more. I have grown up in a mixed environment and gone to a typical mixed school, college, uni, work environment etc.
At college i saw some messes that were created which started as boy girl just friends.
When at uni i only talked to boys for study purposes only, i didnt socialise with them bcos i didnt c the point, as I am a Muslim and sometimes some religious guidance makes sense, and to me this did, bcos I certainly did NOT intend on ending up with anyone from that place.
I am not saying that everytime a boy and girl are friends something has to happen. What I am saying however, is that EVERY boy girl platonic relationship has the POTENTIAL to lead to something else. Yes, people might add here that there is potential to lead to something else IF U LET IT HAPPEN, but being a Muslim and minding that hadith, I think the chances of it happening eventually are high.
Thank you for acknowledging that not everytime a guy and a girl are friends something will happen. That in itself should be enough for us to be open to such a relationship with the opposite sex. If you strictly want to follow a 1400 year old guideline/rule/threat then that is a completely different story and I wouldn't waste my time with it.