I'm just so miserable right now
I can understand that. This does not have to be the end of your marriage though. You can talk this through and resolve the issue. My husband and I have done this.
he said he was sorry he doesn't touch me often, and then he said he felt sorry for me. And then admitted he watches porn
Could this just be him not expressing himself very well? He was sorry, you have taken that as pity but there could be more remorse about it than pity?
The porn bit I'll come to.
DH and I had not had an active sex life from when we first met (aged 19 and 23). Personal issues from his own history lead to an inability for him to climax and/or inability to maintain an erection in 90% of the times we were intimate.
All the talking and discussions we had only served to make him feel more of a failure and exasperated the issues.
Fast forward 10 years or so and our sex life was rare (couple of times a year, like yours). We'd stopped talking about it and just accepted it. One time, in tears of frustration, I asked him if he masturbated (because I worried he was just asexual).
He said he did, a lot. I was devastated ("what is wrong with me?"). Only a couple of days later I started snooping on our PC history and discovered he was using porn.
Initially when I confronted the issue he did not understand the severity of my upset, or the reasons. He thought it was a good thing - that at least he did have sexual feelings, which is what I'd first sought reassurance on, so we had something to work with.
Much talking, crying, shouting and upset later (over the course of several weeks), we got to the crux of the issue and actually dealt with the sexual issues head on for the first time ever.
Physically, DH had gradually become less sensitised when masturbating. He had to squeeze harder (if you've ever heard of the death grip). This meant that he got no stimulation from real sex and real intimacy with me. Likewise, he had started needing more and more stimulation when masturbating to be satisfied, so started using (I must admit it was mild and very mainstream) porn in order to feel aroused.
We have overcome this though. The above all happened 7 years ago. We now have a healthy twice a week (give or take) fulfilling sex life and a very happy relationship.
Quite simply I explained that our real life sex life could never develop unless he changed his alone-time activities. So he had a choice, carry on with his sad wanks (excuse my language) or decide to stop in order to rediscover his penile sensitivity.
It took a while and was very sexually frustrating for him. He couldn't come without his death grip and often just wanted to finish off for the relief. But he didn't. We persevered and over time his sensitivity returned. In turn our sex life returned - in a much better state than it had ever been throughout our almost 20 year relationship.
So there is no need to live in a sexless marriage. But being in one, with porn or otherwise involved, does not have to mean the end of your relationship.
A heart-to-heart and mutual support can result in a turn-around.