Its really a question that you have to answer yourself, Do you think it will work for you? Can you hold a long-term commitment for a large period of time without seeing your partner?
Just my 2 cents, I have never been able to seem them work, If they have succeded in working, the 2 partners must have a strong relationship filled with a overflow of joy, honesty, love and be able to pull the hard yards like a long distance relationship. Usually those cases are very rare, They usually lead to unserious thinking "It will work...I know it will..lets try it" then a period of time later, it's all to time consuming to keep the relationship up, And it doesn't necessacerily mean that you don't love them, you honestly probably care deeply for them, but physicially not been there with you is depressing, and probably lonley on your behalf.
It's really up to you Joana, you really have to decide yourself if you are able to keep up this commitment, and for your boyfriend to pull his way aswell, trust is a large issue, so is honesty. You decide yourself what is vest for you and your boyfriend, you will hopefully make the right decision.
I had a friend whos Girlfriend was moving to Berlin, and from the relationship, you would seem they were inseparable, lovey dovey, flirting, really commited. She ended up leaving, they tried the "long-distance" relationship, it worked well for a few months, he was patient, though persistent, She was aswell, after that the phone calls were becoming less and less, letters did not arrive weekly as they usually should. He got to the stage where he was becoming lonley, maybe a bit impatient waiting for her to come home. This was holding him back with alot of lifes little issues, ie: College, a bit depressed. So he made the phone call to end the relationship. She wasn't very hesitant mind you either. Once he did make the phonecall, he was saddened, but was getting on with life much easier, he did find another girl-friend as well.
It just goes to show what impact it can leave on you.
Good Luck anyway