Lilith is going to be mad that you blocked her; Mad, Sad, and Severely Conflicted.
Most likely when she sees that message she's probably going to cry a bit and try and send him a message back, and she can't, she going to go hide in an alleyway and cry, wondering what she's done.
Nice going Ares. -___________________________-
Edit~ And then, when he comes back in the morning, he going to be slapped, hard, across his face, before she wraps her arms around his waist and starts to cry, whispering repeatedly that she thought she had lost him.
This, this is my plan.
The feels.
Edit 2~ Wait, are they officially blocked and can't message? Or can they message and he just doesn't get the notification?