<human>: Could you distill the essence of the text into 1-3 sentences?

Short backstory: I have been with one person, let's call him Hugh, for over a year and a half. For the past ten months, I was dating another person, Randy, with the approval of Hugh. They both preferred monogamy but were okay with the situation for the time being.

Current: Two weeks ago, Hugh broke up with me because he didn't like that I was poly. I immediately broke it off with Randy because I love Hugh and want to spend the rest of my life with him. I know Hugh wants the same thing, but he does not believe that I will be happy in a monogamous relationship with him and is hesitant to take me back because of it. I know that I would be happy and that for me poly was a choice, not something I need.
<bot>: How can I ease Hugh's concerns? Looking back, I see that the polyamorous life hurt him more than he let on. How can I assure him that I won't hurt him again?