Mr. DiCaprio has made comment on his single status several times.
On getting married one day: “That time will come when that time comes. The truth is, you can’t predict marriage. You can’t plan it. It’s just going to happen when it happens.” 
In 2014, while chatting with CBS News, he said, “I mean, the truth is, it’s gonna happen when it’s gonna happen. And — and I — I — you know, I’m just gonna let it happen naturally.”
Who is he attracted to?
Leo told TV host Gayle King he looks for “humility, a sense of humour and not a lot of drama” in his girlfriends.
As (George) Clooney said during the 2015 Golden Globes, while accepting the Cecil B. DeMille Lifetime Achievement Award, “It’s a humbling thing when you find someone to love. Even better if you’ve been waiting your whole life.”
Marriage is not the single focus of this active thespian and businessman; he is working hard to act, produce, and promote his causes (like climate change).
Personally, I am a fan, and hope Leo finds success in romance as well as his work.