Just stick it in now. You can't fold now and getting it in now ensures he doesn't have the option of checking back turns with draws then folding blank rivers, nor folding worse hands on scary 4 straight turn/river cards.

Do you understand why you're 3-betting here pre-flop?

Also terminology wise, saying "I defend" implies you flat the open (even though 3 betting is technically a way of defending against opens it's not common terminology), instead say "I 3-bet" and yeah try to actually justify why you're 3 betting this hand. Hint....him opening wide is not justification.