(Was wondering how you have been)
It is not so much that porn is wrong but the motives and desires of the heart of the person viewing it.
To me SOME signs that it is not good
1. He chooses looking at the porn over quality time with you
2. He wants to 'do things' that you do not want to do (ex: threesomes,. ) , otherwise he finds sex with you is boring.
3. Always comparing and critiquing how it is 'done better' in the porn he viewed
4. As far as the date sites...
Is he just fantasying what he could have if you weren't in the picture?
If he did run across someone he actually wanted to meet would he go through with it?
Is he just keeping you in the pic until something 'more appealing' to him comes along?