Girlfriend vs. Wife?

Ugh. Help. I've been with my boyfriend for three years and he still hasn't popped the question. Anytime I bring up getting married, he just doesn't seem excited, yet he constantly tells me I'm the girl he wants to marry. 
We have lived together for two years. I cook every meal, I clean the house everyday before he gets home, I meal prep, I co-parent and help  raise his child, bathing her and being the only one who gets her ready, he gets sex every night, I grocery shop, book all of his apts whether it's counseling or the doctor, etc.  and sooo much more. 
Am I doing to much? Am I the reason he hasn't proposed? Like why buy the cow when you get the milk for free...