Neil Patrick Harris and partner David Burtka cover the February issue of gay glossy Out.

In the issue, Harris describes his relationship with Burtka as “constantly changing.”

“Sometimes I'm deeply in love with David and head-over-heels, and sometimes I question whether it's going to work out and is meant to be. It's like a business relationship, as well as a personal one; we have a business together and that's maintaining our love for one another.”

Harris also reveals that it was Burtka who first proposed marriage to him.

“David first proposed to me five years ago on the actual street corner where we met. We were on our way to an event at an Indian casino 45 minutes out of town in a limousine, and David wanted to stop for some reason that I didn't quite get. I thought he wanted to get some booze or something. And then he got on one knee and proposed, and I was so freaked out by it that I said, 'Yes,' but I didn’t know what it meant. Then I got the ring and loved it, and a year later, on Valentine's Day, I proposed to him in Santa Monica.”