Cancer man needs space out of the blue!

I dated my Cancer male for a couple months, I'm a Cancer girl too. It was like love at first sight & he asked me to be his gf 2 weeks after we met, everything felt so right with him so I said yes. Since then everything was amazing and he has been the most attentive and caring bf, we'd talk every day all day when we were not together. He confided in me about a lot of his personal things, and about his family and so did I. I told him in the beginning we could take it slow and there was no rush on being in a relationship, but he insisted so badly that that's what he wanted and he didn't want to wait, so we made it official. I had to leave on a trip for my studies for a couple weeks and everything was perfect even then, he even started making hints about our future together and make plans, he started making hints about us having kids and about wanting to be the last man that I'm going to be with..I was so happy because he was everything I ever wanted in a man and our connection was crazy, we both were feeling so comfortable with each other since day one and it was crazy how alike we were in everything, he always told me i make his life easier and he is happy how along we get and that it's almost scary how alike we are. When I got back from my study trip we spent 4 days together at his house and that following week he all of the sudden told me he needed space. We never argued even once, so I was very confused about where that came from when everything was perfect between us. I tried to ask clarity about it but he didn't want to talk about it and give further explanation. He just said he needed space and he became all cold all of the sudden. He said things were moving too fast and that when I was at his house for that many days it felt like it was too much. We've spent 3-4 days in a row together before too so it wasn't anything new, and we didn't do anything different than before.. I always took good care of him, cooked and made sure he was feeling good. Our sex was amazing too. I tried to understand why he changed all of the sudden and he said that he doesn't know if he is going to be back to my city, bc his job requires him to travel a lot and there is a chance he doesn't come back here. But to me it was never a problem going to visit him even if he had to go somewhere else.. After this he stopped reaching out to me. I gave him space and we didn't speak for a week, after that I text him to see how he's doing and had a random conversation, but it was short beca