As for his attitude:
15.One Ring Cicus
32.Magic Prayer
He doesn't really seem the type to truly honour this Valentine drama - or, as the card says, 'circus'. This card is about a solitary way and it shows a figure sitting on top of an elephant, on a rock in the ocean - so C is not that involved with this and doesn't really connect with the valentine story. He may feel a bit beyond that or like it doesn't truly matter.
However - magic prayer shows that he was touched by your message - the card shows a lady with long blond hair waiving, so you did bring a whisper of this romantic attitude to him, and he was enchanted. You somehow reached him on his solitary rock...and it was magical to him. You put him out of his 'pose' a little and brought some magic. So no, he is not into valentine that much, but he was still touched by your message and it did open a new door for him in some way.
as for his response:
1.Bone Collector
2.Gentle Gardener
The Bone Collector is a very 'old' card - shows impacts from tradition, family, society. It shows C as a member of all this web around him - so his response to you depends on how this situation fits with his preconceived ideas, which may be stemming from deep past and roots. he is hard and 'boney', not easily moved or persuaded - but the Gentle gardener shows again, especially as number 2, that he did respond internally to your message. It is a card of spring and new seeds starting to grow, so his sould is recovering and preparing to new life.
On a more mundane level - he is alone, solitary, and stuck in the past, but you bring seeds of new life, also with this 'magic' message. So he is responding, even if only internally. We have cards 1 and 2 - so progression of steps, but 2 is still duality. No tangible new creation for now - so this makes me lean more on the side that he will probably not really say anything concrete to you, but deep down, internally, he is responding, and seeds are growing.