I see people sitting in restaurants all the time not talking at all to each other. It is quite common. I don't get it at all.

I suppose a good conversation starter is "Why have we run out of things to talk about?"

It sounds like you didn't have much to say right from the start. Maybe all those others I've seen are the same.

If you feel lost and alone, I say find some way to spice things up for yourself. Whether it be with him or finding others to give you more joy.