<human>: Give me the gist of the text in a nutshell

I've been dating an incredible guy for a month or so [26/f & 27/m) , and I am quickly tumbling head over heals for him. We're still very early in our relationship obviously, but I can see us heading in an exclusive direction in the near future. We see each other very frequently, talk every day, have met each others' friends, have a great connection, etc.

Unfortunately, there's a ridiculous little problem, but a problem nonetheless. He has a lot of friends who are women, which I don't mind - they're cool ladies who I like a lot. I have a lot of guy friends, my ex had a lot of women friends, no big deal. I don't consider myself a jealous or distrusting person (normally), but the part that gets me is that his best friend is a woman.

Maybe I've been spending too much time on Reddit, but the thought popped into my head one day that maybe he really loves her, but she won't have him (or vice versa). Maybe I would be the one he's simply settling for while he pines for her. So many funny stories and memories they share! So many mutual interests! *They have cute nicknames for each other!* The thought is sitting in the back of my mind and now refuses to go away.

Let me repeat that I swear I'm normally not a jealous person, I hate thinking these things, and I'm aware that we are still in the "seeing each other" rather than a more serious boyfriend/girlfriend stage so maybe I'm getting ahead of myself, but... I have really high hopes for this guy and I don't want to let silly insecurities get in the way. He's really amazing, and I have no desire to come between him and his friends. If anyone has any advice for getting these thoughts out of my head, it would be much appreciated.
<bot>: I'm probably being a silly fool with my jealousy of my new guy's female best friend, but I can't shut my evil thoughts up. Any advice on getting over this nonsense?