Repression in Brideshead Revisited

What kind of marriage is this? The narrator, Charles Ryder, in Evelyn Waugh's Brideshead Revisited (1945), now (ca 1935?) a successful painter who specializes in paintings of English manors due for teardown because of ruinous condition and to make way for shops and flats, takes a 2-year journey to Latin America to paint the ruins he finds in Mexico and the Amazon region - leaving behind in England his (pregnant!) wife and their young son. Two years! And when he finishes his project she travels to NY to meet him and to prepare for their voyage back to England. Charles is as cold and distant as can be - hardly speaks to his wife except condescendingly, only reluctantly (it seems) having sex w/ her, asks nothing at all about the children. On the voyage home she, like most of the passengers, gets terribly seasick, and Charles uses the opportunity to re-connect w/ childhood friend Julia who happens to be on the same passage. Julie is Sebastian's sister (and a character who is just barely sketched in over the first 2/3 of this novel), and Sebastian has pretty much drunk himself out of this narrative - but Charles in a half-veiled manner indicates to Julia that S was his first love. Julia marriage, the Canadian bounder Rex Mottram, is pretty much over, and the Charles and Julia have sex and it looks as if they're building a new relationship on the ruins of their two marriages (like the houses C paints?). When they get to England, Charles doesn't even want to go home to see his son and to see for the first time his daughter - what a hideous man. But that said, it seems increasingly obvious that this is a novel about the pains of repressed homosexuality: Sebastian drinking himself to death, and Charles unable to love a woman and doing his best to destroy his marriage and his family and to enter into another hopeless relationship. Does Waugh know this, or is this homosexual element an underground stream coursing beneath this narrative, tapped by the author but never directly visible?