Crying after sex

Let start out by saying that me and my SO has been together for 14.5 years now, and I have noticed that in that t last few years I would cry after our sex sessions. Im not sure if that's common or is it just me? I love my SO so much and I know he loves me, he tells me ever day.

I don't know if it's a deep down anxiety, fear or just super happy tears, he makes me so happy I mean like over the moon cloud 98, big bang amazballs kind of love. He doesn't seem to mind it and he already knows it's going to happen, but still am I ok?