Idk what to do

I’m a really anxious person and I get attached very quickly. I met this boy and we are in a long distance relationship. He’s very much older than me and I thought by being with him he would be more mature and I would be happier because he’s older and recently things haven’t been going so well I am very very attached to him. I love him a lot and I really just want to be with him. We had a really bad argument where we said some stuff to each other and he told me that he wanted to leave which scared me a lot, and we called to talk about it. I was basically begging him during the whole call to not leave to just fix things with me he agreed and ever since it’s only been two days we’ve been just talking about it the little amount of time that we could get with the time zones but he hasn’t texted me in about 15 hours or more and I’m just really busy. It’s very unlike him and especially in a time like this I don’t feel like he should be doing this because he knows how anxious I am. He knows how serious I take things. He knows how these things affect me, especially cause I’m younger than him as well. All my mind is going through is just him and what’s going to happen with us if we will break up if we won’t, I don’t know what to do. I just need help right now. I’m freaking out. I’m overthinking. I’m panicking. I’m anxious. I’m constantly constantly crying. I haven’t stopped crying for so long. It’s six in the morning for me. I can’t even fall asleep. I’ve tried to distract myself with friends with games with everything but every 10 minutes I check if he had just texted me I called them six times and no answer. I sent him 1 million messages no answer I don’t know what to do. I can understand that he might want time alone, but he would tell me about it. He can text me. Tell me he’s busy tell me he doesn’t want to talk. I’ll be OK if he tells me that I just need him right now. I just want him to answer me every minute passing by feels like so long feels like it’s not going by. I have no clue what to do. I’m going crazy right now I really really love him a lot and I wish he knew how much I do.