I texted my ex, he replied in 5 mins

Hey 18f here, I texted my ex today just to see how things were going, the break up wasn’t horrible but we didn’t speak at all afterwards so I wasn’t expecting a response, he texted me back 5 mins later basically saying he’s going well and asking how I’m doing. Idk what to say or where to go from here because I didn’t think that far ahead hehe 😅