There is nothing unusual about loving more then one person.
Have your ever wondered that how romantic love we feel for a person is different from the love we feel for our siblings, parents or children? The only difference between the two is the physical attraction that is added to love. In fact, in the absence of this physical lust or attraction, we define a romantic love as a platonic love– a love that is due to our attraction to that person’s some other personality or aspect, devoid of any physical aspect of lust. Thus, the capacity to love is infinite in us human beings. It is perhaps to rein in this capacity and to maintain some semblance of order in society that monogamy was introduced by the administrators and regulators of society. Religion too endorsed it as in ancient times religion and state were virtually inseparable in most societies. It is a given fact that most religions use guilt and subsequent atonement(often some ritual) as a tool for enforcing their authority on their followers. Essentially monogamy was introduced by the powerful people (religious and state authorities) to regulate the powerless.
It’s an unalterable fact that most human beings do harbour romantic love for more then one person in their lifetime. There is absolutely nothing wrong in it. This love can be professed in parallel times or sequential times. It doesn’t really matter. A love is a love.
I would love the day that open relationships become the norm rather then exceptions. That will be the moment when a lot of unnecessary baggage of relationship guilt and blackmailing tools used for manipulating people will become redundant and extinct.