Why am I controlling my relationship?

My boyfriend went to another city for 7 months because of work and I am very unmotivated to keep going in this relationship because we cannot see each other a lot so we had a huge fight. He said I am not only one in this relationship and I try to control everything and doesn't let him to decide to see each other sooner or more. He said even when I say that I don't trust myself to keep up this relationship for 7 months, I try to control our relationship and make myself feel alone.

Why am I controlling my relationship?
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