I don't know
Maybe because Lola showed him that she cares, or maybe because it's ironic that she's asking if he's okay when he's going through such a hard time.
Maybe because he loves her and hearing the one he loves ask a question like that maybe might of lightened up his heart for just a little bit!
Hes happy shes asked
Because he got mad at lauren for not asking
Or he killed kucy lol
did anyone notice that peter smiled when they were sat in the living room watching tv and lola asked him if he was okay? why did he smile?