Dream about walking in on...thoughts?

I have a friend (male) and we are just friends but we are attracted to each other. He is in a complicated relationship and I am single.

Anyway yesterday he told me that he had a dream that he came over to my house to get something from my fridge and the door was open. Thinking that it may have been an intruder, he walked into my apartment.

He then said he walked in and heard/saw me having sex with someone and I was very into it. He said he let me know that he was there and then left quickly.

Any thoughts on what could mean? I don't want too read to much into it, if it means nothing but it would give me some insight into what is in his head at least about our relationship as friends.

Any thoughts?