most likely your man have ED.. or he have things preoccupied in his mind lately than affects him mentally. not necessarily he have woman outside.
if i am you, probably find out the genre of the porn that he frequently surf to.. do a surprise role play out of the porn scene that he is into.. or make him his favorite meals, give him massage etc..
don't recommend you to find your lust quencher outside your marriage as it is destructive and unhealthy..