English has a few sayings about this situation, depending on the circumstances:
If someone you love is away for a short period of time, we say "Absence makes the heart grow fonder", which means that you realize how much you miss the person because they are away.
If they have been away for a very long time, the saying is "Out of site, out of mind." which means that the person has been away so long that you stop thinking about them.
Then again, if they are around too much and you realize you could use some free time, we say "How can I miss you when you won't go away?"