Yes, Kallisti, I understand that your situation is different.

But believe me, the strength of feeling does not depend on in which (Mono- or Polyamorie) relationship you are. This is perhaps rather a manifestation of temperament. But exactly the Love gives
meaning to our lives!!

One, two or several love relationships are remaining as baggage in our life forever.
You can object, "What about the knowledge?" But knowledge does not give us a feeling of fullness of life. The knowledge is the result of work of mind. Searching knowledge - a fascinating process, saturating the time a permanent meaning.
But only something, what we'll skip through the sieve of heart can to give us real emotional satisfaction.
Of course, we can to talk about another feelings, as a hate, an envy, a jealousy, etc... They can also overflowing soul, but they belong to another topic, I think...
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And more ..
Love - it's always a mutual work (at home and aside of), it's the willingness to give, and not just to take. The responsibility? I don't even try to separate it from love, they both are appearing natural, are interlinked. Yes, I would argue that the degree of love and mutual responsibility interdependent. And this is not necessary to sign the marriage contract!

(I'm agree with Raul and Messie) But if a sense of responsibility dominates, then it's not the love already...
Love is essentially reckless (I mean the only love in some way related to sexual desire, not the parental, not love of country, etc.)
Both, women and men are expecting something out of the relationship. If these expectations are the same,

perfectly!, it carries an incredible bliss!
Many people are afraid to take on extra work for love somehow. They have enough troubles at work, and at home maybe.
In love, people don't have to ..., but they want to build the relationships. And if they don't want and "work" as spoken, began to be their burdens, so there is no love, there is another format of relations.
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Nightnurse,

It isn't forum for teenagers, I think.. by the last poll the most of people are older than 30 years there..

It's true the situation I was wrote will not ever repeat, there will be something else, maybe

or was?

who can know?