Parents divorce?

So I know it’s not about me specifically but I found out that my parents are having a hard time and that there’s a chance of one of them walking... my parents got a divorce when I was three so my stepdad has been apart of my life ever since I was little. I’m twenty so I’m old enough to know this stuff happens and that sometimes it’s for the best, but it still freaks me out because the reasons mum came to me with are all things that I cant blame her for being unhappy with..