This relationship was always going to struggle - two immature individuals were never going to see through the pressures that this situation caused them.
I have little sympathy for this man - he is the architect of his own downfall, abusing a position of trust to abuse a vulnerable teenager, and let's not pretend it was anything other than that.
Unsurprisingly, without the giddy feeling of 'romance' to sustain her, this girl has discovered that her fairytale has a base of harsh reality, and she no longer sees it as a viable future.
"Why couldn't she have waited another year? Can she ever be trusted with men again?"
Why should she wait? the relationship never had any sound mature considered future, as evidenced by this man taking her to France with absolutley no forward plan or means of support.
Can she ever be trusted with men again? Why should she not? We are taking a confused immature teenager - all the things she is entitled to be at fourteen, taken advantage of by a foolish immature man - none of which he is entitled to be.
She needs to see this for what it was - a brief infatuation with no solid basis in reality. It appears she has taken the first steps so to do, and move on in a more appropriate relationship.
He needs to try and accept the reality of what he has done, and the simple fact that his bubble has burst, and it is time to start thinking and acting like the mature adult he is supposed to be.
I think you will find it vey difficult to find anyone on AB who will agree with your viewpoint on this,or apparent defence of this man against this girl.