What would you do if everyone else in a game leaves?? Would you leave too??

I encountered this once..We were on a 5v5 fight. My team was losing, so my teammates got mad

After a while, they left, one by one until I'm the only one left. So I left too
It's not like I would leave a game everytime I got pwned.

But Im no pro..I can't fight 5 Players all by myself.

My point is, is it ok to leave when you're in that position??