Maybe occasionally when he's really drunk he admits to himself that Boris is the love of his life, or possibly even tells Boris that (but only when he's so drunk he probably won't remember tomorrow), but on a day to day basis he would probably tie himself into pretzels to avoid admitting it. I can just see Hobie being like "So will Boris be around for Christmas this year?" and Theo's all "HOW SHOULD I KNOW, it's not like he's the most important person in my life and I think about him constantly when he's not here, he's probably got Christmas plans with someone else and I'm TOTALLY FINE WITH IT."

Boris shows up for Christmas anyway, though, because he knows it's important to Theo even though Theo might literally rather die than admit it.

Do we ever see Pippa and Boris interact? It would be really interesting to see what relationship they develop over time.