Why do i feel like this?

I know there was something similar to this posted a while ago, but it didn't give me the answer i was looking for: Ok so here's my little dilema, there is this girl that i'm mad for whom i can not have (she has a boyfriend and even if she didn't she doesn't think that we could work beacause of long distance) Now i'm on good terms with both her and her boyfriend; even though i have told her how i truley feel, i didn't hold anything back, i let it all out (which prob wasn't a good idea, but if i didn't do it i would be feeling worse) Now onto my little bit of confusion / dilema: was watching a TV show in which one of the characters proposed to the other and for some reason that conjured up images of this girl and her bf getting married and that made me feel really sad/depressed and i'm not sure why; yes i do have VERY strong feelings for this girl but i am slowly letting her go (i'm putting myself out there etc.) Now i'm asking this because it is a very real possability that this girl will get married AT SOME POINT but if i still feel strongly then as i do know i need to know why

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