Why is the one missing thing making me unhappy?

I'm 27f. I earn really well, way better than industry standard, have like a 4 day work week and I mostly work from home. I get time to pursue my hobbies and passions. Get to splurge on food and drink and experiences. Like I have everything. My family loves me. I have all the comforts. I have a good routine - i work out, take care of my nutrition, eat my fruit, spend time with loved ones, sleep enough etc.

However, this guy I was dating for 3 months last year (Sep-mid Dec) got a job abroad and moved away. I became quite attached to him while we were together. He was extremely confident that he can make it work even if it's long distance, that he really wanted me to be a part of his life. Before even leaving the country, he'd ask me almost every single day "we'll be fine right? You'll be with me right?" And I'd always tell him that I'd be there through and through. I did mention to him that he might feel differently once he moves away cuz life gets in the way and things change. And sadly, that's exactly what happened. When he got there, he'd talk to me everyday and tell me all that he was learning and seeing. About 3 weeks after he moved away, he finally began the job and got extremely busy to the point where be just didn't get the chance to find time for himself. I was extremely supportive, saying that it's okay if we can't talk and that I just need him to be alright - you know get enough rest and take care of his body and not burn out etc. Anyway, we didn't speak for almost 15 days where I decided that if was time, cuz I felt like he was hiding something. All that happened was that it was his day off and he decided to rest it out not call me, and then went out exploring new spots in the new city. And he thought that he didn't want to hurt me, so he hid the IG stories from me (i knew he hid them, that's why I sent a break up text)

We've been broken up for 1 month now and he hasn't reached out at all. We ended on a good note though. Had a proper conversation where I said that I want to see him grow and learn and experience new things. I don't want him to hide these things from me. I like it when he shares his experiences. I feel happy for him. However the only thing upsetting me is that he did tell me he'll text me from time to time and be a good friend. That he wants to keep the friendship going. I guess I'm just hurting because he didn't reach out at all. And it feels weird to be there for someone through bad times (he had a lot of shitty situations come up while we were together) and it's not reciprocated. It makes me feel quite worthless.

Imagine just one incident/person kinda takes over all good things happening in life. I've had sleepless nights thinking of him recently. I really want to focus on the good. But I can't stop thinking about him. I just really want to come back to myself and get back to feeling content again.