THE COUPLE KEEP THEIR LOVE. OR THE COUPLE KEEPS THEIR LOVE??
Please do not post in upper case. It means you are shouting. When 'couple' is a subject, the verb can be either the singular or the plural.
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Please do not post in upper case. It means you are shouting.
When 'couple' is a subject, the verb can be either the singular or the plural. It is more likely to be plural in British English. Thus, both 'the couple keep' and 'the couple keeps' are possible.
Your sentence as a whole is not idiomatic, but we won't get into that in any detail since your question was about subject-ve