I swear that CB & I got a tip about this months ago. Someone wrote in and told us that Gillian Anderson and her longtime partner, Mark Griffiths, had quietly split up. And now here we are – Us Weekly is confirming the news, and they’re making it sound like the split is recent:

Gillian Anderson is sadly adding longtime love Mark Griffiths to her ex files. “Gillian Anderson and her partner Mark Griffiths have amicably separated after six years together,” a rep for the actress, 43, tells Us Weekly exclusively.

The duo, who never wed, share sons Oscar, 5, and Felix, 3.

The X-Files and House of Mirth actress has been married twice before. She and film art director Clyde Kotz, with whom she shares daughter Piper, 17, divorced in 1997; the star and documentarian Julian Ozanne were married for two years before parting ways in 2006.

Following her role as Miss Havisham in a 2011 PBS miniseries adaptation of Great Expectations, Anderson has a full slate of projects in 2012: the films Mr. Morgan’s Last Love, I’ll Follow You Down and The Curse of the Buxom Strumpet, plus BBC miniseries The Fall.

[From Us Weekly]

I always forget that Gillian is a mom to THREE kids. I probably forget about her because it’s not like she lives in LA, getting pap’d on the regular. She lives in London, and these days she works a lot in British television productions. Considering we got a tip about this months ago, I’d say that Gillian and Mark probably didn’t split up recently – this has probably been in the works for at least this year – I can’t even see that they’ve been photographed together since last year. As for any potential scandals… who knows? Gillian is a beautiful woman, and I could totally see her having a jumpoff.

Meanwhile, Gillian recently clarified some comments she made to Out Magazine earlier this year. Gillian had told Out, “I was in a relationship with a girl for a long time when I was in high school… If I had thought I was 100% gay, would it have been a different experience for me? Would it have been a bigger deal if shame had been attached to it and all those things that become huge life-altering issues for youngsters in that situation? It’s possible that my attitude around it came, on some level, from knowing that I still liked boys.” Gillian clarified in a recent interview:

She has spoken openly about having lesbian flings as a teenager – but it seems Gillian Anderson is less willing to put a label on her “fluid” sexuality. The twice-married mother of three has revealed that the death of an ex-girlfriend has convinced her of the need for a “more nuanced conversation about sexuality and its fluidity”. The 43-year-old first confessed to having had relationships with women earlier this year.

In an interview this week, the X Files star explained: “I decided to talk about it now because someone with whom I was in a relationship a couple of decades ago – a woman – passed away about a year ago. I was talking about her and, in the context of the gentle conversation we were having, I thought I would say that I have had a couple of relationships with women.”

But she added: “I always knew I still liked boys. Being gay was never something that I identified with 100 percent, because I knew that for me it wasn’t the only way. There are so many teenagers confused about their sexuality, and I’ve been aware of the need for being open about fluid sexuality.”

[From The Independent]

Basically, she clarified it the same way CB said – that Gillian probably sees her sexuality as fluid on a continuum in which some people are neither “100% gay” or “100% straight”. Maybe the scandal is that Gillian left her partner for a woman? We should be so lucky. There are lots and lots of X-Files fan-girls who still have biscuit tingles for Scully.

Photos courtesy of WENN.