ok, It would seem that i arrived a little late to this conversation so i apologise if i repeat any of the original ideas of my fellow posters.
The first thing that id like to point out is that you should really examine the dynamics of your relationship as husband and wife. A wife who would rather seek the opinions of the uninformed, anonymous masses than confront her own husband is likely to be repressing and harbouring other concerns about her husband. The longer you repress it, the more intense and disproportionate your eventual reaction will be when you can hold it in no longer. Just talk to your husband in the manner in which you are supposed to be doing. As his loving and supportive wife, his issues are yours too, talking between yourselves should be your first step, then if need be, a therapist – asking the world, in my humble opion, is just pointless.
Secondly, aside from the issue mentioned above, dont necessarily blame yourself. The gemmorah describes tayvas nashim as something which increases the more it is fed. His needs being tended to at home would not necessarily diminish his desire for further virtual helpings. Suggesting this comes from ignorance regarding tayva.
Finally, is this is a discussion room and not a novel, the only way for your husband to emerge from this issue, note the lack of the term addiction, is if you work together, as a couple to strengthen his resolve against this, the most fierce yetzer horah of our generation. Therapy, pills and preventative measures all have their uses but here, its simply misdirected. This sort of thing needs to be solved from the inside and in the confines of a marriage, inside includes you.