Curiosity Not Related to Interest...?

Is "curiosity" really doesn't relates to "interest"? I don't think so...As far as my knowledge is concern curiosity is indeed related to interest. I came to think these two words because our argument with my "brilliant" special someone almost leads to unfavorable decision to both of us because of that two words. hehe...Our argument started when I noticed that she is still interested with her ex-boyfriend by searching his name through youtube. She claimed that she is not interested anymore she is just curious about him. I flared up because that two words are related. But of course she also holds his argument tight that it is not related. Fortunately we're both enlightened and calmed then come up with the decision that I believed fits to ourselves. But in my part I continue to think that two words not because I want to continue to argue with her but to be ascertained with my understanding with that words (for information purposes). When I got home I turned on my PC because I know that there is encarta program that installed in it. I went to encarta dictionary and search the meaning of that two words (curiosity and interest).
here's what I've found:

curiosity [kyri óssəti]
(plural curiosities)
noun
1. desire to know something: eagerness to know about something or to get information
2. tendency to pry: an excessive interest in other people’s affairs
3. somebody or something thought strange: an interesting and unusual object, person, or phenomenon


[14th century. Via French curiosité from Latin curiositas , from curiosus (see curious).]
Microsoft® Encarta® Premium Suite 2005. © 1993-2004 Microsoft Corporation. All rights reserved.



interest [íntrəst]
noun (plural interests)
1. curiosity or concern: a feeling of curiosity or concern about something that makes the attention turn towards it
an interest.

2. quality that attracts attention: a power, quality, or aspect of something that attracts attention, concern, or curiosity
it’s of no interest to me

3. enjoyable thing: something that somebody enjoys doing (often used in the plural)
My leisure interests include sailing, music, reading, and walking.

4. benefit or advantage: the good, benefit, or advantage of somebody or something
in the interests of peace

5. involvement: somebody’s involvement with something that makes its progress or success important to him or her
took a personal interest in the progress of the project

6. finance borrowing charge or payment for money use: a charge made for a loan or credit facility, or a payment made by a bank or other financial institution for the use of money deposited in an account
7. commerce share in something: a legal right to claim a share in something, especially in a business or property, or the business or property itself
8. connection: a personal or commercial connection with something or somebody, especially when this prevents somebody from being objective or impartial
had to declare a conflict of interest



plural noun interests
influential group: a group of people in business or society who have the same aims or support the same cause, especially a powerful or influential group


transitive verb (3rd person present singular interests, present participle interesting, past interested, past participle interested)
1. get somebody’s attention: to attract or hold somebody’s attention or arouse somebody’s curiosity or concern
It may interest you to know that the building used to be a mortuary.

2. make somebody want something: to make somebody want to have or buy something, do something, or become involved with something
I tried to interest him in helping with the preparations.



[15th century. Via Old French from Latin ‘it matters’, from interesse , literally ‘to be in the middle’, from esse ‘to be’.]
Microsoft® Encarta® Premium Suite 2005. © 1993-2004 Microsoft Corporation. All rights reserved.


Here's what I observed:

1. curiosity or concern: a feeling of curiosity or concern about something that makes the attention turn towards it
an interest.