Porn addictions are very real, and like all addictions, they will escalate.

The fact of the matter is that even if it's not an addiction, it still hurts you, and as your husband, he should prioritize your feelings over his wants. If it isn't an addiction, then it shouldn't be a big deal for him to stop.

For some help and advice specifically for porn addictions, try www.pornaddictioninfo.com. They even have a 20 question survey to test for an addiction.