Why not find a new place so you're not a guest in his space? Of course you feel like an intruder if you're just moving some clothes and a toothbrush into women searching fuck his existing house/apartment. Cohabitation isn't a good test for marriage. A lot of people fall into that urban legend. At least you're engaged. suckers move in thinking it's going to lead to a ring, only to realize they've given away all the milk for free!