They can no longer pretend to make it work. For years, it’s been rumored that Ellen DeGeneres and Portia de Rossi have had troubles in their marriage — but an insider tells In Touch that the pair, who tied the knot in 2008, are officially at their breaking point, and divorce is inevitable. “They’re not going to make it. Their roller-coaster marriage is about to derail,” an insider shares.

The reason they’ve held off until this point isn’t a coincidence: Next August marks 10 years since their wedding, and after a decade, California law states that Portia is entitled to more of Ellen’s money (the talk show host is worth an estimated $360 million compared to Portia’s $20 million fortune). Should Ellen want to protect herself (and her estate), she would need to end their union before the big anniversary. But it’s unlikely that will happen — as Ellen is the one hoping to make things work. The insider adds, “[Ellen’s] friends know she would do whatever it takes to stay married to Portia, and she has. They’ve gone to individual and couples counseling.”

It shouldn’t come as a surprise that Ellen, 59, isn’t as keen to divorce as her wife, 44; according to the insider, her controlling ways played a huge role in their crumbling relationship. “Ellen is a control freak, and she pretty much micromanages Portia’s personal and professional life,” the insider explains, adding that Portia is far from innocent. “Ellen is tired of being told to change this and change that about herself. It’s a sad situation. Ellen doesn’t want to get a divorce. She’s a romantic.”

With potential trouble looming around the “10-year rule,” as it’s known informally in California, the legal battle ahead will likely to be an ugly one. The insider laments, “No one wants to see them split up.”