Hello again Benjamina,
As a US citizen living abroad, you are subject to the same filing requirements as every other US citizen. You are also subject to reporting your income not only from US sources, but also any foreign income that you earn. However, if you do not meet the minimum income requirements for filing a US tax return, then you do not need to file a US tax return for any year that the minimum income is not met.
If you are single and under age 65 and your total income from all sources is less then $8,750, then you do not need to file a US return. If you are married filing a separate return at any age, your minimum income for reporting is $3,400. If you are married filing a joint return and both spouses are under age 65, your minimum income for reporting is $17,500.
If your income exceeds these levels, then you are required to file a US tax return. However, if you are a permanent resident of the Netherlands, you would qualify for the foreign earned income exclusion, whereby you could exclude up to a total of $85,700 of your foreign earnings.
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Thanks and let me know if you need more help.