Why do I sabotage all my friendships?

So, if you refer to my previous questions regarding my friend lying about her birthday, it basically said I found out my friend had potentially lied about her birthday by saying it was a couple months before when certain records say it is. I snooped because I thought things didn’t add up and then couldn’t hold it in, so I confronted her over Snapchat. She got upset with me understandably, but didn’t really confirm or deny anything. I don’t know if I’m being manipulated, if I’m crazy, or why I always do this. I don’t know if I’ve just been making things seem worse than they are so that I can have an excuse to ruin a friendship or if it is a friendship I should actually end. I have trust issues, and I genuinely don’t know who is right or wrong here. I know we’ve definitely both made mistakes with it, and she has since stopped speaking to me. Am I going crazy? Why am I like this?