@coworker,
Rescuing someone is to be admired in a way, only can we? Especially, if they are married and so are we.
Then there is the zillions of attempts of "rescuing" someone, attempting to, falling in love with them, finding out that they can not be rescued because they can not change, "unless they want to", and so, all these women leave broken hearted after years of "trying".
What do you want to rescue him from?
If you feel a sense of high, a rush, emotionally, then why not volunteer for a cause that "helps" people and get that emotional high.. There will be lows there too, but I suspect you can handle that, just not this situation as I said, if you are lapping this up, hating the lows, then you are not totally fulfilled in your current marriage and need to work on that.
Also, he stated that "he" doesn't communicate with her, not the other way around, imagine how she feels? What she goes through? Probably very simular, but with more lows. SEND him back to her, to create those highs with her, then you are doing something right.. And, take what you feel from this and work that into your marriage, then you are doubling up on the rights.
If your husband is the only one physically you have been with, often friendship takes over.. Re-ignite your spark ..