The spark is gone but analyze: is that normal or concerning? Map relationship timeline: honeymoon phase vs. stable love vs. dead relationship. Calculate: time together vs. effort invested vs. connection quality. Show me the spark evolution: initial chemistry vs. deep love vs. indifference. Give me the assessment: this is normal evolution, this is neglect, this is incompatibility. Include: whether expecting constant spark is unrealistic, how to rebuild connection, and when lack of spark means it's over.