Its all rubbish! If you want to stay with that person, work for it! People our age assume that relationships are perfect, they are not!
People who have spent 40, 50 years with each other will tell you that its the hardest thing they have ever done.
I have a long distance relationship and yes times get hard, damn hard! I miss her so much sometimes that I want to drop out of Uni! We miss each other so much that we have arguments that bring us close to breaking up, sometimes she hates me and sometimes the feeling is mutual.
But I love her. How I feel about her is overwhelming. And i would fight for her through any argument. I miss the girl all the time, when I wake up, when i sleep. But shes worth it! And if your partner is worth it - stop being a fool about it and fight for them.
If you want it, distance is a small issue.
Good Luck
Jason