I don't want to go into too many details on here but I did something very similar to what the OP's partner has done once.
The reason was that I felt insecure because my partner would not commit to marriage and I was living in his home, contributing to bills but building no financial security.
I wanted the sale to go through first because I didn't quite believe it would and then I told him.
He understood my reasons and that my actions had been driven by insecurity due to his actions (or lack of them), and in the end he made the changes I was looking for, seeing I was in earnest, and things worked out, for a long time anyway. They ended much later and for very different reasons.
Possibly this story is not relevant at all, as OP's partner may have acted for very different reasons to me.
I am just saying, do listen to him first OP, and try to understand where he is coming from. His actions certainly say something. But they don't necessarily say "I don't love you and don't want to be with you". They do say "I need things to change".
Whether those changes work for you, or not, is of course entirely up to you.
Certainly don't move into his house if you don't love him and no longer want to be with him.
But if you were entirely happy before, I would give yourself time to think it through before you decide.
I realise I will be more or less a lone voice saying this, and it does stem from my own unusual experience.
My actions made perfect sense to me, and once explained, my partner agreed they made sense to him too, in our context.