Initially, you continue doing what you used to do with her, out of familiarity, love, the need for a pattern. Soon, you realise the trap you are in: caught between repeating what you did with her, but without her, and so missing her; or doing new things, things you never did with her, and so missing her differently. You feel sharply the loss of shared vocabulary, of tropes, teases, short cuts, injokes, sillinesses, faux rebukes, amatory footnotes - all those obscure references rich in memory but valueless if explained to an outsider.