What does it mean when he lets you spend the night with him?

Me and my best guy friend have recently had sex (about three times in the past two months) and I spend the night at his house, in his bed with him, once or twice a week. We are not dating and we are not together, but we do like each other.

The other night we were chilling at his parents house and he let me spend the night there with him. Is this significant at all in any way? I do want a relationship with him, but I don't want to rush him as I don't really know what he wants right now. Any advice on that as well?
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P.S. We broke off the FWB thing three weeks ago, his idea.
What does it mean when he lets you spend the night with him?
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