What’s the secret to having things heat up outside the villa? Well, according to “Love Island USA” host Ariana Madix, it can be hard to make relationships last post-season. “Well, you never know, because in the villa things are so condensed and you’re living together, right? And of course, when real life starts happening, it’s tough for any relationship, regardless of how you even met,” the Broadway star, 40, exclusively told The Post while on the 35th Environmental Media Awards green carpet .