He just isn't interested anymore. This is not a strike, has gradually cut down over weeks and weeks to just the morning feed and this has reduced in length over a long time to maybe 5 seconds if that. It makes me a bit sad as I am so keen to feed for as long as he needs/wants it... I guess he just doesn't need/want it any more 
I've never been in love with bf, so this isn't about me missing out on something particularly, just that I don't want him to. iyswim.