Quoting ℐ+ℳ=£:" SO and I have been together for almost two years and have a 5 week old baby together. We moved in together ... [snip!] ... at the moment. Sorry if this is really rambling and incoherent, my 5 week old was a ratbag last night and I'm exhausted "
Porn is something people should always discuss before marriage or entering into a serious relationship.
Some people are ok with it in their relationship some are not. For me, I am not ok with porn. I have religious reasons why that are important to me, but I have non religious reasons why aswell.
I think you should come to him and talk to him about it. Now I will say him watching porn does not mean he doesn't find you attractive or anything like that. It's just something guys like to masturbate too because they are visual.. and it's really tempting for them. (aswell as women.)
Some advice on the porn would be, don't yell at him over it! He probably lies and hides it because he's ashamed and doesn't want you to get upset with him. I would sit with him and ask him if he's seriously willing to stop his porn habits.. If he says yes, then I would suggest looking online and doing alot of research on temptations with porn and how to help and all that. Come up with a plan with him. A plan where if he gets the temptation to look at porn he has a back up plan.. something planned to do instead when those temptations arrise. It might take awhile.. but be supportive and talk to him about how it's important he is open.
If he says he's not willing to give up porn then you need to decide if you can stay in the relationship.
Now about the flirting with other women, that needs to stop... I would really reccomend counseling. I would start having some heart to heart talks with him. Write does some questions and whatnot to talk to him about and let him know he needs to respect you... if he's flirting with other women that way he's not respecting you.