My current gf and I recently had to spend 2 months apart doing a temporary LDR and it sucked. I wouldn't do it again and the only reason I did it in the first place was that there was an official end date.
The basics still pretty much apply -
- Keep yourself busy (You cannot for one second let her think that you are moping around the house missing her)
- Don't be too available but also don't ignore her. Find the balance.
- Never give her full disclosure of what you're up to. Hold back details and make her wonder. Keep that hamster spinning.
I don't strongly advise this but I used to switch my phone off once a week (never on a Fri or Sat night) alternating the day. First week it was off Tuesday, the next week Thursday etc..) Her hamster WILL spin up the worst possible scenario ie. you being with another girl.
Set up a date night once a week where you are on facetime/skype with eachother and watch the same movie/tv series together. This will help in meeting her emotional needs.
She will still sh!t test you. Don't fall for it, maintain your frame.