Yes, they do teach this threefold law, but it is not correct. You will receive your lesson from what you did wrong, but it does not need to be threefold. You will receive it until you have learnt it. It could be in this life, or in another, but you will receive. It can be once, it can be ten or a hundred times.
Yes, if you receive the bad, then you invoked it. My own life is very much messed up because I have done bad things in previous lives, but this life is also my chance to show I have learnt, if I fail to do so I will have to redo this lesson. And this is something I surely don't want. And yes, with this life, it is probably more than three times that I received from where I started, but I could have avoided it by learning my lesson in the first place.
This time I have the best conditions, as cruel as it sounds to myself.
So to get back to the topic: Do not use magick for the bad. Ever. Your price to pay is not worth whatever you want to do.
You can not live with the current situation? Do magick to gain new opportunities in your life, to get possibilities to relocate or at least work somewhere different. Of course you will also need to apply to different jobs, but you will most likely succeed.
It would be the same with love. Yes, you can bind someone to yourself, but you should not. You can make yourself more attractive with a ritual, and you will more likely be noticed by someone who is compatible with you. Do good to yourself, not bad to others.