@Embarrassing, I'm going to add to my previous reply here.

To answer your question, you are definitely NOT overreacting. He has betrayed you on two occasions telling you he would stop and he did not. It seems his habit is more important to him than the relationship and respecting your wishes. Not only that, but he has been lying to you.

No wonder you feel the way you do. I don't know what "premium" Snapchat is, but it almost sounds like something you pay for?

It IS a form of cheating because he is enjoying his porn which doesn't involve YOU, but fantasies of other women.

Imagine if this goes on and on AFTER you are married, and then you discover he is still doing this behind your back? Imagine how betrayed, insecure and awful you would feel then?

I have an example for you: my husband used porn while single and while also sleeping in separate bedrooms for two years while he was celibate and not having sex with his ex wife. When we met long after they had separated, I told him I would not date anyone who uses porn. I told him "why does a man need porn and other women IF he has a special woman in his life?" He agreed with my perspective and said he would stop using it out of respect for me.

After being married for a while now, last night we had a conversation about porn again. He told me he hasn't used it since we've been together, and that I had changed his whole perspective on porn. He said it IS a from of cheating to be fantasizing about another woman other than your wife or significant other, which is what porn does to a man. They fantasize that they are performing those acts to the woman or women involved. It makes them sexually want and desire those women. And yes, those women are typically more beautiful than the average woman, which can make the female partner feel far more insecure and inadequate. It leaves you feeling like you're not satisfying your partner enough that he has to find others. And there's so many different forms of porn now: men can actually chat to live porn actresses and interact with them on live web cams. Who knows how far this goes with your boyfriend. If he has it on Snapchat and is paying for it, he may be interacting with these women and talking to them sexually.

If I were you, I would leave him. He has betrayed your trust more than once and on something that is important to you. It shows a total lack of respect and disregard for YOUR feelings. Would he also cheat behind your back? Would he continue to hide this and lie to you throughout a marriage? What else would he lie to you about and do that shows disrespect for your feelings? These are serious questions you must ask yourself BEFORE agreeing to marry him.

In my opinion, this man is not marriage material and cannot be trusted. He may even have an addiction to porn since he cannot stop. Is that what you want?

I would view this as a major red flag and a very good reason to NOT marry him. For your own sake, please don't go through with it. It would really suck to get married only to be hurt and betrayed, and then what are you left with? A divorce and bitter hurt feelings.