Being Pushed Away- Feeling selfish..

Hi, I am new to this site and I have no idea where to even begin but i know I need to start somewhere. I have never had anyone i care about in my life have cancer, I never even thought it would be something I had to deal with in my life. One month ago I met the most amazing guy and almost immediately we just clicked, it was like the cliche "love at first sight". We have spent every moment together bonding and creating a healthy trusting relationship, getting to know each other and telling out family and friends about each other. He isn't my boyfriend but we talked about making it official. He even just recently celebrated his birthday three days after mine. I am 23 and he is 24. He has showed me what its like to feel cared for and appreciated and I've fallen for him hard. He calls me by every cute name in the book and is a hopleess romantic at heart, he's just so funny and goofy and cares about me and my family/ 

However the worst thing to happen to us was him finding out he has testicular cancer. He had found out a few days before our trip to Florida and he eventually broke the news to me the very first night of our trip. He couldn't stand the thought of not telling me so he told me early. He only told me, his friend and one cousin but refuses to tell his family. He doesn't want them to be worried for him and he reassured me many many times to not worry and we would be okay. As hard as that was we went about our trip for 5 days not trying to think about it and move forward and during this time he showed me so much affection and made me feel loved. The reason for me reach out on this platform is because that has all changed. The day we decided to drive back home he wouldn't say a single word to me in the car, and it was a 10 hour car drive. He didn't want to look at me or hold my hand or even talk. He was cold and distant and it hurt me so much. He was upset and overwhelmed with work he said but I think it was because he was finding out the nest day the stage of cancer he has. 

He has Stage 2A testicular cancer and it treatable. For now it seems like that was a small sign of good news because they caught it at a good time and the tumor was smaller than they expected. He called me with this news and I was 100% supportive and not trying to cry or show that I was sad, for his sake. However, it was like a switch, out of nowhere he told me over the phone that its best I don't see him that much because he doesn't think I should be around. he was rude and short and didn't even sound like the guy I've seen almost everyday. He only calls me by my name now and it sounds like he hates me sometimes..He said he's not cutting me off or ghosting me but he's busy with work and wont have time to take not even the weekends to relax. He's acting like work is more important than his health and I don't even know what to do. He isn't even going to tell his parents.they live in the UK and he's all alone In a big house. I felt devastated and extremely selfish, I know this isn't about me, he's adjusting to the fact he has cancer, that doesn't even run in the family. I know he is scared but he is pushing me away and I feel so hurt and angry. I told him I'm here for the support and I can handle this and be there every step of the way... There is so much more to this but I feel like I'm writing a novel now..

Please, is anyone else having the person they love push them away and close them off. Im not giving up or leaving, I can't. I know he doesn't hate me but will this pass? will it get better if i just give him space...? I just need advice or support because I'm an emotional wreck.