Every relationship I've been in becomes long-distance because of work. It's never worked out. It puts an intense strain on the relationship, and at a certain point, it becomes too difficult.
In a relationship when things are really great you don't need to say anything and just enjoy the other person. Sometimes with a couple, it gets dark and you don't know what to say and that silence can last all day. Other times you don't want to stop talking because you don't want to lose one another.
There's only a handful of people I trust completely, and I know who they are. Other than that, I pretty much don't trust people.