Me and my ex dreamt about each other ON THE SAME DAY?

It has been almost 3weeks since HE broke up with me (as his feelings were not progressing), we were together for a month or so.
I had a dream about him last night (just casually saw him in my sleep) but i was scared of something so i woke up with my heart beating fast.
Before i told him about it he confessed that he had a dream about me last night too -this one is an erotic one- he dreamt about seeing me randomly and going with me in a hotel, me kissing him and touching him... placing my hands around his neck (like i used to do) but moving his hand around my butt. He said he woke up as his heart was beating fast.

How do I explain this to myself?
Me and my ex dreamt about each other ON THE SAME DAY?
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