Hey guys this question is for my friend , her and her husband thinking about getting a divorce? need advice?

They have been married for 4 years... she feels like she has fallin out f love with him.. she doesnt have the same connection with him as she did when they first got together, they both have unrealistic expectations of eachother , ( which they both knew how the other one was before they got married ) Most recently he has left out of town due to his job and wont return until May .. during this time she has been talking to a man that she met a couple of months ago ( he lives out of state) she has become quite fond of him but also feels bad because she is married and doesnt want to hurt her husband . Since her husband has been gone they talk on the phone everyday for about 3 mins , she ran out of things to say to him ... adn doesnt really care if she talks to him or not ... MY QUESTION IS CAN THIS BE FIXED ,,, HE REALLY WANTS TO BE MARRIED AND SO DOES SHE BUT SHES NOT IN LOVE WITH HIM ANY LONGER !!!!!!!!!! WHAT SHOULD SHE DO .. HELP !!!!!!!!!!!