Most Helpful Guy
My friend, before getting into a relationship, it's always better to be friends to get to know each other. You been in that phase enough, to know if this is gonna work or not. Sometimes in life, we need to take tough decisions. Let him know that you're not happy with this. If you have to make him take this seriously, you need to sometimes do it in a harsh way. No other way.
Most Helpful Girl
Most relationships after the "honeymoon" period tend to get comfortable afterwards. He feels like he has got you so now he doesn't feel like he needs to put in anymore extra effort. From what your saying, he sounds extremely lazy.
You could talk to him about it and see if he will listen but I feel he will be pressured to start a conversation all the time, so reassure him you guys dont have to talk everyday (if you want to, set your standards). If talking doesn't work, actions always speak louder than words. Dont reply to anything he sends until he starts a proper conversation.
You guys should meet up more often, texting can get boring! Try calling him, facetiming him etc.