Hand 1: I prefer to 3bet pre with JJ out of position. As played, c/f flop without reads given the bet sizing and take a note. The question you need to ask yourself when calling a pot bet on the flop is what are you going to do on the turn facing a likely double barrel. C/calling pot on this flop and then c/f two-thirds pot on the turn tells villain you can be bullied off medium strength hands, not to mention wasting money.

Hand 2: Pre seems fine but c/f flop. Jamming is terrible against this player.

Most important thing is to keep a look out for this villain. It's clear that he keeps barrelling with the betting lead without slowing down and two-thirds pot seems to be his standard bet - look out for any changes to his bet size and let this guy hang himself. You can own this guy and separate him from his bankroll in no time.