"He’s a really nice guy that treats me well. Part of my issue is I should be happy with that shouldn’t I?"
No, that is not enough - the fact that he treats you well is as it should be but that's just one condition required for a relationship and that alone is not enough. It's easy to get a distorted picture on the relationship threads but I think most men are nice; that doesn't mean you date them all. You're just not feeling it. And while it's perfectly possible for the necessary feelings to grow, I think that would have happened for you by now if it was going to happen.
And it is actually hard to feel it with someone who always agrees with you. You don't want someone who mistreats you but you do want someone who has their own ideas about who they are and what they want to do - i.e. someone who exists independently of you. He sounds sort of insubstantial.
I completely get how you feel when you say your life would be so easy if you were feeling it with him. I'm pretty sure everyone has had that experience - men who were interested in them who ticked every box but just didn't attract them and life would be so simple if they did. We've probably all been that person for someone else also - the person that someone else wishes they could feel it with because it would make life so simple.
You say you're worried about hurting him. In fact, you will hurt him far more if you keep him in your life when you're not feeling it. By doing that, you're preventing him from meeting someone who really adores him. Also, if you already feel like this about him, the relationship will end - you may end up having an affair - the whole thing will be really messy, chaotic and possibly nasty. If you end things now, he will experience some short term pain but it will be much better for both of you (since this is about you as well as him).
Also, why would you give yourself away so cheaply? You don't owe him a relationship. As if often said on MN, don't set yourself on fire to keep someone else warm. Your relationship is still young and yet you're already bored with him. It's not going to get any better if you're not feeling it now. Wouldn't you prefer a partner whose company you enjoy? By whom you feel (in a healthy way) stimulated? Who has his own ideas about where to go and what to do?
The suggestion that he will sell his house, move in with you but it doesn't matter if it doesn't work out, he'll just move on again - hmmm, I'm not at all sure that's how it would play out. If he is already trying to make you feel beholden by the presents he gives you, then surely he'll be saying things like: "but you agreed I should sell my house and move in with you and how you're saying you don't want me here".
Honestly, OP, from the outside looking in, this sounds like a relationship that should end before he takes such a serious step as selling his house to move in with you. You're not doing either of you any favours by allowing this to continue.