Darren Criss is a ''sentiment hoarder''.

The 31-year-old actor is notoriously private when it comes to his personal life, and he has now revealed the reason he doesn't over share is because he likes to keep things to himself.

He said: ''I'm so weird about talking about my personal life ... Deep down, I'm a sentiment hoarder. If something is special to me I don't want to share it with the rest of the world.''

The former 'Glee' star does have social media accounts but doesn't keep them up to date as often as he would like to, but says his lack of posting is down to being ''too busy doing interesting s**t''.

Speaking about social media to Rogue magazine, he added: ''One of my greatest curses, and this is a much deeper thing, is I wish I posted more. I'm not a very big social media person, I'm horrible at it. Mainly because I am too busy doing said interesting s**t and I think everything is interesting and funny, that if I was to take the time and post all that ... I would never be observing said interesting fun s**t and I would always be on my phone.''

Despite not being an avid poster on social media, Darren did update fans in January this year when he popped the question to his longterm girlfriend Mia Swier after seven years of dating.

Posting a picture of them together, the 'American Crime Story: The Assassination of Gianni Versace' actor wrote: ''Mia and I have had seven and a half years of fun, wacky, wonderful, CRAZY adventures together. And I'm happy to announce that we're kicking those adventures up a notch. We're goin for it. To boldly go where neither of us have gone before. Engage. (sic)''