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My boyfriend and I recently broke up. I had always imagined us getting back together but he told me a few weeks ago that he thinks he might be poly. He told me that he doesn’t want to lose me but I feel very uncomfortable with a polyamorous relationship. I guess I am just looking for more information to support him and find my role in his life with this new discovery. I know that I would be unhappy in this type of relationship but I don’t want to force him into monogamy either.
I think your role in this person’s life is just “ex.” Perhaps “friend.”
You two broke up for a reason, and wanting or hoping to get back together doesn’t necessarily mean you should. You say, essentially, that you don’t want to date him polyamorously or monogamously - you don’t want to date this guy. There is enough information here to indicate that you two should not be in a relationship.
There is nothing special that you need to do to “support him” or “find your role in his life.” Be civil, obviously, respect his presence in your past, and see if a “friendly exes” relationship works, but other than that, you should try to disentangle yourself emotionally from whatever this dude has going on.