I don't think they have lost any love for each other, they're going through a rough patch. While the whole Tritter thing was hard on them I think it was the end of Merry Little Christmas that was the breaking point. House scares Wilson to death thinking House is dead. House may be a bit hurt that Wilson leaves him to die in a pool of his own vomit. (Seriously, the hell Wilson?) If you see House's actions at the end of that show as a suicide attempt (even a subconscious one) then Wilson has every right to feel a bit abandoned. When someone you love wants to die it's a bit of a slap in the face. Right or wrong it feels like you aren't worth sticking around for.

So Wilson may have tried to pull back a bit emotionally to save himself. House is clearly a trainwreck waiting to happen and Wilson may not be in a hurry (after his brother) to see someone else he loves self destruct before his eyes.

Then Wilson thinks House has brain cancer and to make matters worse House doesn't tell him. Then it turns out he doesn't even HAVE brain cancer. At this point most sane people would run screaming away from the relationship.

So when House comes to him claiming more health problems it's no wonder Wilson ignores him. If you can fake brain cancer faking a wonky bladder isn't a stretch.

BUT! Anyone who didn't love House to little bits would have abandoned him and his crazy self destructive self a loooong time ago. Wilson still sticks around, can still be prodded into caring (and doling out more drugs) ergo there is still some love there. House still goes to Wilson when something is wrong which is maybe his way of showing the love.

It's a screwed up relationship but it's definately still in tact.

(anon again, this is Greeblygreebly from TWOP someday I'll have a real LJ of my very own, I swear)