So this is my story I came to Switzerland last year on a marriage purpose visa from Tunisia I got married with my EU national partner that I've been with together for almost 4 years. Recently I got heartbroken when I found out that my partner is messing around with other people it feels like a train hit my chest he doesn't know that I know. my B permit is tied with his permit it means that if we brake up I have to go and I don't want to go I love this country and i want to stay. Now I'm in weird situation I can not live like this any advices?

Don't get divorced, then you don't lose your permit. Also, find a job.

One year of marriage is highly unlikely to be sufficient (on its own) to stay. Find work, show you're integrated into Swiss society and maybe you have a chance. I know someone who managed this when her Swiss husband left her after 18 months (he incorrectly believed she was having affairs behind his back).

don't divorce, have fun with other people too. maybe you find somebody else to marry.