The trouble with ambiamorous.

Getting some light pushback on my being ambiamorous, which is due to me being willing to adapt to the lifestyle (poly or mono) of whomever I am dating, and stick with it for the length of the relationship, even very long term.

From the perspective of both camps (poly or mono), it's a trust issue over whether I am more likely to leave because I am not solidly one thing or the other. I don't think that it means I will flake out. Has that been people's actual experience with ambis, or is that just their fear.

VERY LATE EDIT: Aside for clarity. I should be claiming prospective ambiamorous, not being ambiamorous, because it's a lifestyle; it is something you do or have a history of doing. I haven't done shit.