Write a breakup email — the final email in my outreach sequence.

**Context:** I've sent 4 previous emails to [prospect type] about [topic]. No response.

Rules:
- Open by acknowledging the silence without guilt-tripping: "I've reached out a few times and I know your inbox is relentless."
- State clearly that this is the last email: "I won't keep filling your inbox."
- Offer something genuinely useful — a resource, a benchmark, an insight — with ZERO expectation
- Close with a permanent open door: "If this becomes relevant in six months, I'm here."
- Under 80 words. No emotional manipulation. No countdown timers. No "last chance" language. No hidden pitch.
- Tone: one professional respecting another's priorities.