Why is life both good and bad?

For some reason life seems to constantly alternate between being good and absolutely terrible for me personally.

One year life is amazing and everything I do works out well and I don’t have to worry about things. The next year everything falls apart and literally everything seems like it is against me.

For example a few years ago life was awesome. I had a long term relationship, comfortable job, awesome friends etc. Now I have none of those things I’m barely getting by and the worst part is I have no idea what happened. Like I’m sober and have been for 5 years now. I don’t do anything risky or anything which would have cause this to happen. It just did for some reason.

Like my partner decided they wanted something else, my friends just randomly stopped texting and hanging out, my job made over half of the company redundant and nobody is hiring. I genuinely feel like I got cursed or something.

A lot of the time bad things just happen to people even those that don’t deserve it tbh. It’s like life just decides one day to make your life good or bad and you then just have to do the best you can with what you get given.