I think you and him just need to sit down and talk about the different situations at hand.....Because you never know he might mean everything that he is saying about how he wants to marry you and want you to have his future kids but he probably dont know how to sit down and talk about any of this....He probably wants to call you and text you first but he maybe feel the same way you feel about nagging or bugging him and doesnt want to do that.....Just sit him down and let him know how you feel about different situation and see what he says and take it from there. But I'm pretty sure it work from there.