Need help

I’ve had this boy best friend for about 2 years now and I’ve always had a crush on him but never told him. Now for the past couple months he has started to show interest in me and we have been acting like a couple but he has never asked me to become his girlfriend. My best friend ( who is also his best friend) asked him if he wanted to be in a relationship with me but he simply stated that he doesn’t want to be in a relationship but he really cares for me and wants to be a part of my life. I’m so confused should I ask him to be in a relationship or do I not. because the other day he said that he wanted to get me a promise ring. What does this mean I need help. BOYS ARE SO CONFUSING 😭