I imagine there are very few people who show the same at work as in their family life and other private relationships. It does not mean one cannot love or get attached to a colleague, mentor etc who is an excellent partner in that endeavor. The problem and pain, IMO, is more when the intense attachment happens to a manipulative, abusive, unhelpful person. Not that it is easy to prevent it - if it was, we would not read so many bad therapy stories here.