i wish he would because at the moment he is giving me no solid reason so it might actually explain how he actually feels.
You will go back and forth through the stages of grief - shock, denial, bargaining, anger, depression, acceptance.
It’s been a long relationship so it will take time for you to process and come to terms with this loss. It seems that you are understandably in the shock, denial and bargaining phase as he has told you why but you are unable to hear it or accept it right now.
No one needs to deliver a ‘solid reason’ as defined by someone else. It seems it has run its course for him and it’s not satisfying enough for him:
“Just came out with he didn’t think he loved me anymore, felt more like housemates etc. however it was me who got him to say it in the end, he came up with nothing really”
“Housemates” suggests maybe sex-life is incompatible.
From reading these boards over the years I would suggest there is someone in the shadows - maybe not an affair yet but a connection.
The end point of the grief cycle is ‘acceptance’ - it’s a painful process. I doubt whatever he said to you you would find as a acceptable reason for his choice.
I think it’s important that he moves out and you sell the property up ASAP. It’s not your call to sit on it until the market improves (if ever) - he can force a court order on that and you would be unreasonable and controlling to force this situation IMHO.