<human>: Can you provide a brief overview of the text?

Let me explain the broader scope, and specify the inquiry

I was unquestioningly polyamorous for several years. Within the last year though, I started to realize there is something intangibly valuable about the monogamous status of a relationship... but I don't know what it is. 

At the beginning of September, I met a boy who is monogamous and I want to be with him, and I feel the open status of a relationship shouldn't be important enough for me to turn up the chance to be with a great person.

However I currently feel I would gain nothing by preventing him from having sex with other people, and I am reluctant to surrender the opportunity to sleep with new guys, for as long as the relationship should last.

I won't go back on my word, cheat, or try to pressure him into an open relationship in the future, therefor I must find myself convinced of its value before I commit to monogamy.
<bot>: I genuinely want to know the reasons why you feel monogamy is valuable, and enriches a relationship more than having sexual openness.