Mom who is constantly in my business?

I'm talking to this guy and my mom won't stop being in my business. I'm 17 and she's suspicious of everyone because I've gotten hurt so many times by guys and now she just assumes he's going to hurt me too or only wants me for sex. I told her she needs to stop because she's the one who's gonna push me away, from him and her because I'm trying to fight her from getting inside my head and believing what she's saying about him. Just because he was on facebook this morning while at work but didn't text me, or he was on instagram a couple hours after he said he was going to sleep or liking girls pictures, keep in mind that him and I aren't dating and I think my mom is just over thinking but what should I do???