Live card room problem - when to leave

Studying leaks in my game is always very difficult. I think I probably do more things wrong than right on some days, but other days I am extremely positive and think I played great. But I still have the problem with cash games as shown in the example below:

I bought in to a low-stakes NL game for 50BB and played for about 4 hours when I was sitting on 130BBs.I thought about leaving but decided to carry on until eventually I lost it all. Of course the last hand was a cooler where I flopped the nuts and a maniac called off his whole stack chasing 3 outs and hit one of them on the river. But thats a massive swing (-130BBs) and I got up and left for my "drive of misery" home.

Why can't I leave with a win. This seems to be a recurring theme., I chip up nicely and maybe I start playing bad, or maybe the other players figure me out but more often I seem to lose my whole stack when I get AA or KK and get it all in pre-flop against some lower pair who gets a set or flush or straight on the river. I have tried to keep the pot small when I am deep stacked but the other guy always wants to push all-in with his QQ or JJ so I have to call with AA or KK. Sometimes I flop the nuts and then get my stack in just to get drawn out on. Most of the times when I lose my whole stack I have got all the chips in when I am ahead.

Maybe I should be glad these idiots are drawing so thin and I should stay longer and buy back in knowing I can win it back again if I play longer. But I do not do this. Losing my big stack seems to happen to me after I have already considered leaving so its easier for me to get up and leave right away. ie. at 5pm I think I am winning $250 so I should leave but I will just play for a little bit longer. At 5.50pm I lose my whole stack and think damn, Im going home. I was going to leave anyhow so why put more money in - just play again another day.

So why can't I leave when Im ahead. Is it an ego thing - I am winning and can win more so I will play just a little bit longer. Is it "addiction"?

I think I have to set some limits and see if it helps. Maybe have a set time to stop playing whether I am winning or losing. Or maybe quit if I lose 50% of my stack or as soon as I double up. Or maybe I should hit and run. I know Daniel Negraneu says the latter 2 options are one of the biggest mistakes players make - leaving a winning table when the hit a target amount or playing a hit and run. He says if you are winning and running over the table you must stay until thats not the case. But maybe I cannot see when it changes.

So figuring out when to leave a table and leaving with some profit is definitely something I need to work on.