What did he mean by inviting me to dinner and talking about the house?

My “almost always” friend asked me after the evening training if I would go for a kebab with him, he was very hungry. So I agreed. He wanted us to sit down and eat there. During dinner he showed me a picture of a modular house, that he would like one in the future, he explained to me where and how he would like to build it. I told him that I had seen these houses before, I liked them, and I was considering one in case I got divorced.
I was surprised that his girlfriend didn’t know about it and he didn’t plan to tell her, and also that it had been his dream for about 4 years. What did he want to say this evening?

What did he mean by inviting me to dinner and talking about the house?
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