[ Previously, he was interacting with her as a capo would with a civilian; it was part and parcel to keep secrets from her and obfuscate how much he knew. At this point, though, their relationship has changed somewhat - though it's only been a few days from his point of view - and the situation has changed more than "somewhat." There's no reason not to be honest with her now. Especially because it's exactly as she says: there's no one here he can call an ally but Trish.

Her flippant response gets a short exhale through the nose - the ghost of a laugh. Too tired and stressed out to actually smile about anything here... ]

I'm not a capo anymore. You're under no obligation to keep sticking with me.

[ Bruno shifts, moving to a more comfortable seated position. Frankly, he considers her luck to be extraordinarily bad, getting stuck here and having to run into him again. Under any other circumstances, he'd tell her to cut it out and go back to life as a normal girl - she shouldn't have to deal with the underworld a second longer. Doing that right now, though, would be pretty callous. Which is why he continues. ]

That said, if you're volunteering... I'd be happy to have you.

[ He doesn't think she's scared of him or anything like that. But Bruno is Bruno. He's looking at the situation logically; it's not unreasonable to think Trish might feel obligated to do as he says, especially since he approached her first. ]