If you feel that you would let them down, that probably think too much about yourself. Everyone is replaceable and if for some reason it's not true, that person should be replaced. In the latter case most probably he/she doesn't let information flow around, etc.
If you just feel too much attached socially, that's understandable. But if it is not only about the daily routine of drinking coffee/eating lunch with the same group of people, then you'll find a way to keep in touch. And if those relationships are worth enough to keep in touch, better that way...
For further actions, you may consider blocking this person and/or reporting abuse
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If you feel that you would let them down, that probably think too much about yourself. Everyone is replaceable and if for some reason it's not true, that person should be replaced. In the latter case most probably he/she doesn't let information flow around, etc.
If you just feel too much attached socially, that's understandable. But if it is not only about the daily routine of drinking coffee/eating lunch with the same group of people, then you'll find a way to keep in touch. And if those relationships are worth enough to keep in touch, better that way...