Ask Marshall
 -I asked my boyfriend what he would do if ever lost me, and he said "I don't wanna talk about it."
He either really likes you that much, and doesn't want to think about ever losing you.
OR
He isn't sure if the feelings he had for you when you started dating are still there. If you start to notice that hes acting distant, not responding to text messages, or ignoring you in person then I would go with the second choice.
-Marshall