Fiancé dumped me

As the title suggests, my partner (29M) of 4.5 years, fiancé of 2 years, broke up with me (28F) yesterday.
It’s been a rough couple of weeks, but on the whole things have been really relaxed and nice lately.
We had an argument over something silly, then he walked off and text me saying “I think we might be done”.
I caught up with him to speak face to face, and we argued some more. He told me that he’s realised after spending time with his baby nephew, he wants a family in future as a non-negotiable. I’ve always been open about the fact that I’ve never felt maternal, don’t feel much around babies, and have felt from a young age that I don’t want them, but that I really want to want them, and hope that in future when the time, circumstances and person are right, that feeling may come. If anyone was the right person it would be him. As the relationship progressed, he said that he doesn’t mind not being a dad as his priority is being with me, and if that means just enjoying his nephews and nieces, that is enough for him. It ended with him saying he’s very angry but he’ll come home tonight, which felt confusing.
That was yesterday, I cried all evening and left the front door unlocked in case he came back. He didn’t. No text, no call, nothing.
I’m trying to come to terms with what my life probably looks like now. I have no family except my mum and dad, but they are separated, we are not particularly emotionally close, and don’t spend loads of time together. I have about 3 friends from school, one of whom I see once every couple of months, the other two live far away and we don’t stay in touch very well but are very close when we do get a chance to meet up.
I have a great job that I enjoy, and in two weeks I have the most consequential interview of my life thus far, for a funded training course which I have beat hundreds of applicants to even get an interview for. I had a terrible day yesterday; I had a mock interview with my colleagues ahead of this, during which I felt like I crashed and burned, felt humiliated and cried about. This was somewhat the backdrop for the original argument. I feel so upset and angry that he has dropped this on me right now.
I’m sitting in the flat we rent together, feeling so lonely and frightened. I haven’t left my bed today.
I guess I’m just looking for advice, stories of hope, anything to get me through this period.