<human>: Can you give me the gist of the text in a nutshell?

Kevin and I have been very good friends for 5+ years and it has always been a platonic relationship, we both are not attracted to each other at all. 

Kevin and Lina have been dating for around 8 months. Lina's ex had cheated on her with the supposed "girl bestfriend" which makes her suspicious about me. 

I have met Lina and known of her for some time but was not formally introduced until they started dating. I have also hung out with the two of them before, but definitely not as often as I hang out with only Kevin. She is a nice girl, but when Kevin confides in me (not that often) about their relationship troubles I do see that she has some flaws. Personally I don't think the relationship will go far (we're young) but I support Kevin and try to help him with his relationship when needed. With most arguments though I do side with Kevin and Lina knows that I will have his back. 

I feel like Lina must hate me/be jealous especially because of her past relationship. I'm not sure what to do because I feel like I have to hang out with Kevin less or only have small talk? I should add that several people in my life and his believe that we should be dating, but we both know that it's strictly platonic.  I know she is a bit uncomfortable about me as she's expressed it to Kevin before, and he explained that there is nothing going on, but I don't know what I can do on my part. Is this even my problem or more so Lina's insecurity? Thanks in advance :).
<bot>: My guy bestfriend has a girlfriend who is uncomfortable about me and his relationship, which is completely platonic. What can I do?