Lost feelings, left at the hotel

There was a guy a worked with for 2 years and he tried anything to show me he liked me and he cared for me. I liked the attention but was honest that I don't really feel the same way. We started talking every day, with him being really close to me. He asked me out on multiple occasions and I finally said okay. We had great time together but I didn't want to be with anyone from work bc I cannot separate the two things.

He got a new offer from abroad and that's when I became more open and started liking him. After 3 weeks he came back and we had a day together, it was really lovely he said he had waited for this for 2 yrs.

He moved back to London and he started being abrupt. He told me he is not good w the distance but assured me that his feelings for me didn't change.

I really trusted him and knew he would be honest to me bc that was our policy and he spent so much time and effort to be around me. I told him it's okay if he wants to cut contact or if he found someone else etc. but he didn't even wanted to hear about it.

After a month I visited him (this Tuesday). We both were looking forward to it, had planned it etc. We had dinner and walked to the hotel. He started kissing me and after some time he stood up and he said he didn't have feelings for me, he thought things would change when he sees me but it didn't and he had slept with someone from work already. I was SHOCKED. Didn't know what to do, he asked me to leave, I refused and wanted an explanation to process this, didn't expect it at all.

Eventually I left and he never even asked me how I feel afterwards. I texted him he ignored and was watching my IG stories but then blocked me. I feel so heartbroken and listless, he just acted like he never cared about me at all.

I want to talk to him but it looks like he hates me and he won't pick up and will probably block me off everything. What should I do?