Teach me the ways...

I Trying To teach myself to be ok with my SO's porn habits. I find porn hot, but it makes me feel insecure when he does. Makes no sense! Any suggestions on letting this go? Anyone else feel the same way I do?

(Back story, I woke up once when I was 6 months pregnant and found him at the computer beside our bed looking at naked chicks online. That's when my insecurity started and I haven't been able to shake it since. We have had discussions and he assures me he's a different person 9 years later and that he watches for the acts not the women).