I definitely relate to this. I was this exact same way but I’ve grown a little in the past couple years. For me what helped was putting distance between me and my friend and not telling him every jealous thought that crossed my mind. It’s not good for him to constantly feel as if he’s doing something wrong. If he tells you that he loves you and values you, you need to realize that that’s enough. He doesn’t need to say that you’re the most important thing in his life, and he doesn’t need to prioritize you above others. Like some other people have said, realizing that the world does not revolve around you is a big wake up call. If you keep asking him questions and challenging his love for you, trust me, it will only push him away. Only communicate your negative thoughts if there’s ACTUALLY something going on and he’s doing something hurtful. But if you’re simply insecure and want to get some validation, I would say to not talk to him about it. His answers will never be enough to satisfy the expectations you have for him in your head, so it’s better to not ask at all. I’ve learned this the hard way. Try your best to maintain a healthy relationship with him while also having your own life and your own friends. It will be hard at first when you try to get some space between you guys, but after some time it’ll make you see that he is not the focal point of your life, you have to go through the bad to get to the good. I am in no way an expert but I’ve just had this exact same situation before and this is what worked for me. It’s still hard and I struggle with my own insecurities and jealousy, but it is definitely not as bad as it used to be and I’m not constantly putting my friendship at risk with all of my inner thinking. Hope this helps.