Dear Starting, I am so sorry this has happened to you and I sympathise so much. You must be very shocked and upset and at sea.
Firstly, take a deep breath and listen, I promise you this is going to be alright. It's a good thing you haven't had kids and there's lots of things about this situation which you will one day soon see as extremely important and lucky for you. I know that sounds like nonsense but trust me that's true.
I know this is going to be difficult to hear but it will be the case that as time goes on, you're going to discover this was worse than he is making out. There's a pattern and a script to these things and people don't claim not to love their partner for eight months then leave to be with someone they have only had a few drinks with. He's telling you what he thinks he can get away with telling you and pretending its's protecting you.
Right now you need to surround yourself with people who do care, even if it's us on here, and you need to prepare to get angry. This man has not been stressed he's been cheating and detaching from you. You have to start detaching from him and thinking about all the ways your life can be better without him. and it will be. no one who's been sponging off you financially and making you feel insecure and devastated is the right partner for you. She's welcome to him.
The house can wait, first of all give yourself a break, find some time for yourself or with people who care about you, and slowly start to think about what you want YOUR life to look like, not as a bank account and skivvy to him, but as a start living for yourself, not for someone else. One day this will be exciting. i promise.
But this man is not a friend to you, you know he's done you wrong. I know it's been a really really long time and that's tough, but a relationship can become like a habit, you're scared because it's all such a shock and unknown. But that doesn't mean you actually will miss HIM. He's lying to you, things are probably more serious with this woman and so he's become infatuated. It's nothing you could have done, nothing you could have been, cheaters have to start detaching and dehumanising their partner to allow themselves to stray. You need to know that to start thinking screw him, let him think he's got one over on you, you are better than that. You are not someone for him to mess around and pretend to pity. Think about yourself and what you need. It's going to hurt for a while, but one day, I promise, it's going to seem like the best step you ever took.