I'm the DH and I travel internationally for work. Time apart is healthy for sure, but I miss DW terribly when I'm gone (from a week to up to 2 weeks every couple of months). While she does keep her self busy with her friends (and our kids), I know she misses me - she tells me and sends me pictures and texts that are undeniable proof

We try to talk every night/morning, even if it's a just a quick hello, we want to hear each other's voices.
I make sure to do all that I can around the house before I leave and we typically have an incredibly passionate night the night before I leave. And the day I get back is just a lot of pent up energy that finally gets to be released.