Insecurities causing issues

I admit to being a very insecure person. Sometimes I have severe breakdowns and my boyfriend is one of the only people I talk to as I’ve recently moved and I literally don’t know anyone else in this town. So, I always let him know what’s going on, sometimes not in the best way possible and I realize this.

In my past relationships it’s been way worse and I’m very proud of the progress I’ve made but I feel as though I’ve plateaued. I hate putting all of this stress on him but he always knows when something is wrong, I’m really awful at hiding how I feel. My mom’s side of the family also has a pretty bad history of clinically diagnosed anxiety and I grew up watching her hate herself and compare herself to other women. I’m not blaming her, it’s just what I grew up seeing.

Has anyone dealt with something like this in their relationship and fixed it before it ruined everything? I don’t know what to do and I feel like I’m driving him crazy even though he’s been nothing but supportive and I’m tired of being the toxic girlfriend.