Blunt and honest response apart..
Here is a big big hug for you. I'm not in the same situation but i know how it feels to be not valued enough.
I think you really know already what to do..just you want to know why this is happening to you. You do everything and its not enough...he needs to know your value..
Need to step up. Stop talking to him for few weeks ..no contact..and see what happens. Does he even miss you..and if he misses you is it more like he misses his future wife plus mistresses on the side life?
You have to deal with this before its more confusing and complicated. I wouldn't trust every word he says so easily..his actions should prove otherwise.
Please step up..be cold..uncaring..like really you need to be treated like a princess.
Khalas.xox