I got backstabbed

I keep experiencing this. I know a lot of people love me (my circle is pretty small but still) but people just seem to be evil. Like this one guy I was friends with told some girl I was also friends with that I was keeping her as an option incase I cant find a gf (Im not that kind of a person). I got backstabbed before by other people (my whole old friend group, I also got threatened and bullied) I just have the clearest intentions and people are going around trying to hurt me for no reason. I thought my life was getting better and Im stuck with this betrayal. I have a hard time trusting even my closest friends now and the smallest interaction seems like I have to strategize to keep myself safe. Im always stressed and anxious.