Has anyone had experience with a partner/husband with a self-professed porn addiction?

My on again-off again live in partner (we have an 11mo baby) confessed to a porn addiction about 6 months ago. He went to about 3 help sessions and that was it & reckons he quit about 3 weeks later. He has been caught lying about a myriad of things during our 2 yr r/ship and has recently started telling me to wear sexy underwear to bed as a cue that he is 'hungry' so to speak. He sometime pretends to speak with a pursed gay type accent. I'm concerned that his porn addiction cure is a lie & that he may have many many more Dark secrets. Pls help. His selfish personality is ruining both my son & my life...not to mention his own... he just can't see it.