It's not the reason that Han would prefer for the two of them to get closer, but this scoundrel is going to take what he can get. She might find herself trusting him more when she gets to know him. Or that Han has found a way to make her care about him despite her best attempts to keep insulated from him.

"Sure." He says with that lopsided smile of his. "If you want to keep it that simple for now, but there's more to both of us then the weapons we carry."

He's not trying to pressure her into disclosing anything. On the contrary, what he wanted to suggest is that he's not in a rush to unravel her every mystery. He hopes that puts her at ease on some level.