SUBREDDIT: r/relationships
TITLE: [Advice] on how to handle insecurities while in a relationship.
POST: I (26F) recently submitted a post stating that I thought I was going to sabotage my relationship because I was projecting feelings onto my partner (29m). It didn't get much attention but there was one comment suggesting insecurities. 

Here's the link to my original post: 

It elaborates more on the issues I'm having. I honestly don't know how to describe it. I don't think clearly about things. Instead, I worry about things that I know don't make sense. 

I've realized that insecurity is 100% my problem. I have been actively searching for new ways to get through this and put it behind me. I'm getting better everyday, but there are times where I struggle.

I came here because I want to hear other people's experiences either being in a relationship with someone with insecurity or someone who struggles with it as well. 

Are there certain things I can do to make my partner more comfortable with what I'm going through? (We've talked about it but I know he's worried and doesn't understand why I feel the way I do sometimes.)

How did your partner's insecurities affect you and your relationship?

Are there things your partner could have done to help you understand the situation better?

Are there things you or a partner tried that worked?

I don't really have one specific question. I just want to get all the information I can so I can tackle this head on and get on with my life. I want to make sure that my partner is as comfortable as he can be in this uncomfortable situation, too.
TL;DR: 
Dealing with insecurity issues. Looking for experiences and advice on how to deal with it while in a relationship so I'm well prepared to face these issues. 