Confused

So I was at the house of my friend and my crush was also there. I don't know why but I am so jealous of my best friend.
My crush liked my best friend but she didn't like him back.
So anyway this guy whom I liked for years is still close with my best friend and she knows that I like him but the problem is the two of them were so sweet and I got jealous.
I know that I should not get jealous and trust my friend but the two were always together and they were texting like they were keeping a secret. And some of my friends trapped the two of them in th terrace and when we got back they were so close.
Ugh!! I am so jealous and confused! Should I just ignore it and trust my friend? Or should I just let the two of them be?