new to sex

my boyfriend has experience, and he is my first

we did it , it was deep penetration and felt good

he did it for a while

then i got dry

he told me come lay next to me and relax for a bit

i didn't really understand

if i was happy and he told me to relax

can dryness be caused by climax and satisfaction?

help me understand please

thank you

i am sometime dry but when i am not turned on or mentally or physically tired

this time i was happy and soo in the mood