I've also got a mate who is hugely under the thumb.
Whats worse is, it's mainly not his choice, he just wants her to be happy.
She lives with her father literally around the corner from him, yet he has moved in there and is paying board! She treats him as though he is her son, cooks him tea/breakfast, does his washing ect.
She doesnt have her license and lives 10 minutes out of town, but works in town. He picks her up from work everyday and drops her off. Some days she will work overtime and its only then will he come round to my house and see me, and leave when its time to pick her up.
I had a chat to him saturday night and told him what i think of it all, told him hes bound to lose mates if he continues going down this path and what not, he agreed on that statement so hopefully my words dont just fly over his head as im not the only one who is sick of it all.