I think you can count on one hand the number of porn relationships that have lasted long term, especially if they started when the couple was both young.
I do know one retired porn couple that just marked 26 years but they are the exceptions to the rule.
There's all sort of extra issues on top of the regular ones you mentioned that make a porn star couple relationship harder to maintain.
Also as you said, people change and evolve, especially when they're younger and a lot of times, that change makes it so a relationship doesn't survive.
Finally, I'm sure both are sad about what happened but , yea the current postings we've seen show Jake seems to have moved on, Clark hasn't.
Won't be surprised at all if they soon cut off all ties, even though they say they'll stay friends.