As you might expect based on the title, "Triangles," last night's episode of Private Practice revolved around a number of complicated, often contentious love entanglements.

Though it could have been called "Quadrangles" in Pete-Addison-Sam-Violet's case.

If you missed this week's Private Practice, our episode recap has all the plot details. Below, we attempt to sift through the romantic wreckage in our review of "Triangles" ...

Addison and Sam's new girlfriend, Vanessa, clash in this week's most dramatic pregnancy case of all time: A surrogate carrying triplets may very well die. Unless, well ...

Addison reduces her carrying capacity to one baby. Seriously, where do they think these things up? In any case, Vanessa suggests an alternative to keep all three babies.

Can Addison be in love with two people at once?

It involves Sam doing risky surgery on a blood clot, but the couple is all for it despite Addison's objections. The procedure is successful, for now, but the tension builds significantly.

Later, when Kayla develops another clot, she codes and is able to be kept alive only through life support. Addison is right, although in this case, she'd clearly rather have been wrong.

It's a tragic story, and juxtaposed with Addison's personal drama. She's supposed to be in love with Sam and Pete is supposed to be in love with Violet ... but what about each other?

This quandary, especially after she sees Pete holding Lucas, makes her uncomfortable, but in the end, they kiss. And she tells Naomi about kissing Sam before. Naomi is very bitter.

Follow the jump for our take on the rest of the night's drama ...

Speaking of Nae, she's involved in quite the love triangle of her own, with a twist that certainly sheds new light on a medical project all three of the people are working on.

Fife has done a trial for an ALS antibiotic, which William wants to get human trials going on ASAP. Naomi is hesitant, but Fife takes her out to dinner to "present his case."

Smooth one, Fife.

William wants this project up and running so he's okay with it, despite Pete's suspicions that his reasons may be personal. He was right on: William admits that he has ALS.

Pete wonders if he’s pushing the project forward prematurely as a result, and with good reason. At dinner, Fife does a summary of the reasons they should do the ALS trial.

He wants to get the business part over with for obvious reasons. Later, Pete tells Fife about William, and Fife suggests to Naomi that maybe they shouldn’t rush the trials.

In response, Naomi asks Fife to raise his chair to the point where they are face to face. They’re close enough to kiss, and they do. Wow. We totally did not see this coming.

Finally, Cooper treats a young girl with an imaginary friend, and asks Sheldon for a psych consult. Last week, of course, Cooper had caught Sheldon naked with Charlotte.

He also tells Sheldon that Charlotte is just using him. The two of them actually get into an incredibly awkward fight while rifling for food in the kitchen. Very mature guys!

Charlotte catches them rolling around on the floor. She reassures Sheldon that what they have has nothing to do with Cooper ... anyone out there buy that for a minute?

As for the girl, Coop and Sheldon put their differences aside. Her dad fears if she's schizophrenic, she may commit suicide like her older sister, and that he's responsible.

He doesn’t want anyone to take her away, so Sheldon and Cooper tell him he can stay by her side the entire time. That's exactly what he does in a very emotional scene.

What did you think of Thursday's Private Practice? Comment below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.