He wants to "slow things down"...

[sofaraway]

Unfortunately I think this is his way of ending things between the two of you. I dont believe it will last once hes gone.

[fearoflove]

Once it becomes long distance, it will fizzle out to nothing. Just let him be. But you know the cliche "When one door closes, another one opens". Take this as an opportunity for you to experience other people and newer things too.

[Split_interests]

Just so we're super clear, none of us knows your situation. Sometimes long distance works, sometimes taking breaks works, sometimes distance is a good thing, sometimes not. You're going to have the best feel for what the situation is. Do what you actually feel is right and it's the best choice you could make.