If someone is rejected, the person needs to accept that.

When a person opens up about having a crush on someone, there are always some people who are eager to give a hand. But usually (I think "often" is another good word to replace for "usually"), they (are not considerate of the person's crush), (and) even overstepping the line (or instead of "line", "boundaries"). (Instead of this lengthy sentence, I tried to shorten it a little and make the sentence flow. ^^;) **"overstepping one's bounds" is a common idiom that is used.

The spectrum of feeling is various(wide?). A The color(s) of (the) rainbow is (are) not just seven bands, the continuum of it is difficult to (cannot) be defined. By the same token, one should not judge someone in black and white. One can, at the same time, like some aspects about a person and dislike other sides. Liking a person is not always linked to seeing(another good word to use is "viewing") the person as a potential boyfriend or a girlfriend. Just because liking or loving someone doesn't mean (that) it has to (or instead of "has to", you can say "must be", which has a -stronger- meaning of what I think you're trying to convey) be reciprocated with the same feeling, or   (and) conversely, being (having) unreciprocated (feelings) is not always (equivalent to) being hated.

If the feeling toward a man or a woman is not reciprocated, one should not force the feeling (by) harassing the person. Once the pressure is started, that is not just a pure feeling but a twisted feeling. An attitude of respecting and accepting the feeling is needed.

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You had some minor errors in your writing, but it is coherent overall. I really like how you used the spectrum as an analogy to feelings. Your journal entry was a nice read. ^^