My "coworker" was my husband and I went through what Rick is describing (and to some extent, am still learning in all relationships).
Here's a thought for you...Be your own best friend. My girlfriends and I have been practicing this. We realize that we treat our friends better than we treat ourselves. We give them the greatest advice, we're always there for them and we always stand up for them. We love them so much and don't want them to hurt in any way. But we don't do this for ourselves. (One friend suggested to me I envision my heart and soul as my own child. I immediately had a different perspective on what I was worth.)
So, next time this happens, picture yourself defending your best friend or your child. See if that gives you the strength you need. 
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