Why do I cry when it’s over?

I (18f) identify as asexual and for me that means I don’t enjoy orgasming often and I definitely don’t choose to alone but I still enjoy sex with my boyfriend. I like how expressive he is and I kind of feel it when he finishes too. But after he finishes I often just start bawling my eyes out. I don’t think I’m sad or anything I just start bawling my eyes out and I don’t know why. At first I thought the d was just too good but I don’t know.