[Mathieu]

Flop: Your hand is in bad shape against his 3 betting range. Geez it would probably be in bad shape even against is pref-flop raising range. Even if he is making a continuation bet, he most likely has you dominated and "improving" might be costly. On average you have a little less than 3 outs here. Clear fold even with 11.5-1.

Here you have to call BB's bet given the size of the pot. Once MP3 raised, this is again a clear fold. He has no reasons to raise an underpair here. If he is raising he has the A with most likely a kicker better than a J, so fold.

Edit: forgot about your hidden outs, you have roughly 3 out to win and 3 outs to split (maybe more if he 3 bets AQ) since you are getting about 10-1 plus implied odds, you can call and fold the river UI.