Feel sad with and without a friend?

I have this friend that always does things that make me upset. I don’t think he really realizes it. For example, we celebrated 4th of july together yesterday, and he was texting other people and looking on his phone a lot of the time. It made me upset. But whenever he was talking to me, I was happy. However, whenever I’m not around him, I still feel sad and I miss him. It’s like he makes me happy, but the irritated me and makes me sad at the same time. But then I’m sad even without him, and get jealous when I see him with other people. I don’t know what to do about this. I really don’t want to let him go, and I want to make our friendship work because I don’t know what I’d do without him. But I want to stop feeling sad, irritated, and jealous.