(Spoilers ADWD) Cyvasse on a boat and a big mouth

Tyrion and Aegon play a game of cyvasse on the Shy Maid while Tyrion lectures the boy on whom to trust. Why does he tell/manipulate Aegon into choosing to abandon the idea of going to Dany? There doesn't really seem to be some end-game in his mind but just his usual big-mouth nature of riling people up. What did he gain by turning Aegon and JonCon away towards westeros instead of dany?