Well, other than that, you might also consider the fact of usefullness. Sure girls dig it. Won't help you much though. You can say 5 or 10 sentences in french in a whole month, just at the one occasion where you meet a girl that is impressed with that.
But as far as I know, Spanish would help you alot more, right now, and also later on, because more people speak it.
Or it could just be me not liking French
And if you lived in Belgium, then it's likely you learned French there, it's one of our two national languages, next to Dutch.