^Yep, all of the above.I don't find being mysterious something I prefer. I like to know the individual, coming off as an enigma to me might first grab my interest but to keep me you can't still be that way. Men that have kept me in longer relationships are very real and like solid rocks. I'm attracted to non-flaky people. As Red put, trying to hide information or being back in forth in their wishes is not something I find ideal in a partner. I like it upfront. A lot of times I don't notice when someone is flirting with me. If they're being coy, I might just think they're being friendly. Someone has to be very upfront with me. My husband is an INTJ, he came off as Mr. Darcy and was like I love you and I have romantic intentions. There was nothing enigma about his statement.
My husband isn't difficult or hard to understand. If anything he's very forward to me and extremely caring. Though I've noticed I'm the only one he treats this way. I'm attracted to his rather forthcoming bluntness, the way his Ni studies me, and interacts with me. We also have a lot in common and enjoy the same things. We're on the same page of moralities. He's probably my best friend too. One thing he's not is an enigma.
In conclusion, there is no way I would stay in a relationship with someone who was an enigma or find it as an attractive trait. I need stability, commonality, and above all else friendship. If someone is hot and cold with me and tries to play a game of cat and mouse, I just walk away. I don't have time for that nonsense.
It's a shame that memes and websites such as Thought Catalog perpetuate this idea of ENFPs being obsessive Sherlocks who want to "solve" their introverted love interests. Mystery might be alluring to teenage ENFPs but I think with experience most of us got bored and learned to value upfront, open conversations instead. And in INTJs, that would be found in their blunt Te questions and answers (though I'm not specifically into xxTJs). Maybe it correlates with the development of our own extroverted thinking function that hits us in our twenties or mid-twenties.
Anyway, I agree with everybody who tells you to just be yourself and not play any role. Good luck with your ENFP !
“It is only shallow people who do not judge by appearances. The true mystery of the world is the visible, not the invisible.” - Oscar Wilde, a fellow ENFP