[Mathieu]

I don't know how this game plays so take my advice with a grain of salt...

Anyways I don't like the flop raise because I think all the better hands that you have Fold equity against would be likely to play it wa/wb here. Maybe I'm wrong about that.

I think if he is betting, he either he has you crushed and wants to play a big pot, or is taking a stab at it with a medium pair hoping you will fold a bigger pocket pair.

I only like the flop raise if you think that this guy would lead out with under pairs including QQ & KK, and fold them to a raise. Otherwise I prefer calling or folding. I think we need this guy to be extremely straight forward for folding to be correct though.