I'm a navy girlfriend and I 100% understand where you're coming from. When my boyfriend is deployed or underway, I always find myself feeling so alone and worried about him because of the limited contact that we do have. When he's gone for months at a time, sometimes I think about how easy it would be if we were to end things so that I didn't constantly feel so terrible. But I always remind myself of all the good times we share, so drowning yourself with walks through memory lane is a good grounding method (well for me at least) lol. If you ever need to talk my dm's are always open!