How do you know when to leave?

My job is OK, I don't hate my job, but sometimes just feel boring about my job, it seems like I do the same thing everyday, and no passion is job, but if there is an opportunity with high salary or good develop for my career, I think I will change my job, the only reason I still sicking to it it that my work place is really a good place to practice English.

..yeah.. indeed there are considerations why we still stick to our job even if we are not already happy.. Just like me, I really really wanted to look for other jobs.. however, my present job pays well.. But I want a working environment where I could feel comfortable.. That's why I am considering to look for other sidelines so that if I transfer to another job, then at least I have other sources of income since in our area, the company I'm working is one of the top paying institutions.. The thing is, I don't like the management and I am not happy anymore.. I told myself that what is the use of working when I don't get to enjoy being in the institution.. I do love my work because this is my passion already but I don't like really the environment and as I've said, the management.. Biases and being subjective is very evident..