I think a lot of times, we hold onto things that are not good for us for way too long, because it is familiar to us, and we know that the alternative is taking a chance .. stepping out into unknown territory, which is scary. However, the question you REALLY have to ask yourself is.. am I happy, here?
If you can be happy where you are, then you should take that into consideration. However, if you have a long history of living in a toxic, negative situation that drains from you more with each day, without giving back into you, it is only a matter of math...more negative cannot result in a positive. In THAT case, it is really a choice between remaining in a negative and draining situation, or it is the unknown that CAN be good or CAN be bad. At least in that case, you have a 50 percent chance of happiness, which is already above where you began. Given THAT reality, there really is no choice, unless you desire to continue to deplete.
Familiarity can give you a sense of security, but, if that individual or situation is not protecting, providing, or even noticing what you need or desire, it is a fake security. Familiarity isn't happiness. In fact often times, we find happiness is unexpected and UNfamiliar things, giving us a reason to step out into that unknown more often.
Side note, I added links to all my books on this blog, forwardtohappiness.com, so look at the post below this one for those links.