My boyfriend doesnt get hard when i blow him

Jade • 🍑
Now the title may conflicting but hear me out, anytime my boyfriend and i are getting into the mood and groove to have sex he will eat me out for so long its amazing but the minute i go to return the favor He isnt hard anymore... i take it kind of personally because with previous partners ive never had one not be hard while i give them a blow job... any reason as to why?!