Confused. How do you decide?

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How do yo know if its time for you to take other job opportunity? Im confused because things are going well in my current job, there maybe an opportunity for me to be able to join in the training workshop in a couple of months. ( still not sure if im the one chosen) Right now, a friend who's a creative head in one of the company, ask me or offered a job opportunity in their company. It's a different industry and i guess i'll learn something new there. The problem is i don't know if its the right the to move on or ill just stay at my current job. I haven't know how much will be the compensation will be? But that only secondary, the one that bothers me is that if i resgned at my current job and choose the other, i may regret that the thought that there will be a greater opportunity for the months and year to come (as our boss stated there will be trainings next year and 3 will be abroad). Well on the other hand if im not the one choosen maybe i would regret it also. Quite confusing. So how do you decide? When do you realize that it is time to go?