we've become echoes

Because that's how they handle things: every three or four months, Boris gets a new girlfriend and disappears from his life, so that Theo can deal with his disastrous marriage, have some unsatisfying, chore-like sex with Kitsey that leaves both of them frustrated and bitter, and fall into a depressive state again. Then one day Boris comes back – talking about how love went wrong, and he tries hard but always loses, but that won't stop him from loving because that's just his inner nature – and in a matter of time they find themselves like this, discovering new layers of skin again, even if they'll try as hard as possible to rip the word again out of their minds.

Trying to fix what was broken from the start is a hard task. Talking about it is out of question. No matter how much time passes.