AJs in MP

I'm not gonna say anything about your stack size, I'm going to assume you forgot to top it up or auto top up not working or this dude stacked you the hand before and you working on getting your money back.

Should i 3-bet pre-flop? And if he push pre-flop should i fold that hand?

Looking at his stats (if I am still reading HEM stats right, its been years)I would say no, 3bet, get it in, you need the chips. But I much prefer the way you played it. He could show up here with 55, 66, 77, 88, 99, TT or K or A high, plus draws.
Reload get it back.

I recommend using the automatic reload option on PokerStars and start always with at least 100bb. This way you get better implied odds to defend with AJs against a UTG open. Sample on the villain in this hand hand looks small and if you give hud stats it's also smart that we know what they mean.

Pre-flop seems fine, but if you would make a 3bet you need to fold against a 4bet. Flop play seems fine. You want to protect your hand against draws, but it will be tough to get value with a shove. You get only action of a flush draw or top pair or better I think in a multi way pot.

Cheers,
SDK1987

If you're multi-tabling the auto-reload option is a necessity, but otherwise, not using it makes you look like a fish, which can cause other players to treat you like one. But never let it get below 80% since if you do you miss out on so much value when you get it all in.

Actually, I just checked, and on PokerStars you can use the auto-rebuy and set the level to 80% and get the best of both