Sam knew there was a possibility she wouldn't believe him. Either thinking him crazy or a liar. He had no evidence to back it up -- he could say some things about Steve, but given how famous he would have been she could easily chalk that up to other means.

Sam doesn't say anything more until she asks her question. He doesn't want to get too much into this, they're both under enough emotional duress without adding the resurrection of dead friends on top of it. He considers his answer carefully.

"Yes. He's well enough. He has people he can call friend and he's save the world enough times." He knows she probably wants to know more, but he really doesn't think it's the best time to be opening up those wounds. He can only imagine it, honestly, and he regrets bringing it up -- but at the same time he really didn't see another way.