I gave up trying - Doing no contact

So I asked yet another time. She still doesn't know/says 'No', she outright rejected me. And I deleted her of facebook, and said I will have to quit contact for a while, perhaps forever to regain my emotional stability. We talked some, so she understands.

Now, she just stopped following me, deleting me skype, off everything. What the hell:C I'm still gonna have to do this, but is she really this cold? I miss her already, like my heart aches, badly. Considering begging her to take me back, and stay friends/****friends.

What the hell do I do.

No, you're not better off cutting her out slowly. And remaining friends is an awful idea.
You're better off cutting her completely and feel absolutely miserable for some time, but feel better faster after that. And although you probably don't care about it atm., keeping a slice of your dignity will make you feel better in the long run.

I was dating a guy and I saw it falling apart about a month ago. I cut him off - I was the one to really end it, although I sensed he'd been drifting. I've felt bad this entire month. Yesterday he updated his profile picture to a picture with a girl and I thought I was going to die. But I am not messaging him and I am not "remaining in touch". The only two consequences of that are a) you'll come off as needy and desperate and b) it'll take you longer to move on.

But you see. She already has a girlfriend of 3 years. And she has too much empathy and concience to leave her even if she's got feelings for me. She told me she wouldn't leave her unless it was catastrophic. I just gotta accept the fact she will never leave for me, and try only see her as a f***friend/very good friend.

Didn't help that we dated half a year. And she is still interested in being intimate with me, stuff like that. I think I just have to meet somebody else with her on the side - because I'm too attached to her.

The fact that she stays with her girlfriend means she likes her girlfriend more than she likes you and consider her better long term material. No matter what she says, that is the situation.
If you've been intimate with her while she is in a relationship, she is also a cheater. If she's willing to cheat with you, she'd be willing to cheat on you.
You need to cut her off because she'll drag you down with her. If you still have a slight sense of moral, you'll dismiss her. You're also screwing over another person.

But her girlfriends keeps her there by being a crybaby, not leaving her peace

Like you, you mean? Where you stropped and deleted her then cried for her to come back.

I can't empathize in this situation, had this been a heterosexual relationship you'd have been flamed by now for being a "home wrecker" "slag" "man-stealer" which the Relationship section of TSR has been known for doing.

If she "wants to make it work" with her girlfriend then obviously she still likes her, she's probably feeding you the "we don't have chemistry!" line to keep you around. As you said yourself, her actions always speak louder than her words.

Everyone else here is right, applying no contact will be more healthier for you in the long-run than "waiting another 6 months then fading her out."

Also, what happens if you meet someone else? Are you going to be like she is to her girlfriend and run off and cheat on her?

I honestly think this girl is messing you about and you need to cut her out of your life. I know it's hard and hurts but in the long run you're better off. The fact that she never told you she had a gf and didn't stop being intimate with you even when her relationship was no longer open makes her unfaithful. I don't believe infidelity is black and white - it seems like a very complicated situation - but she needs to make a decision, she can't have her gf and you too and it really doesn't seem to me like the two could ever be "Just friends". I feel harsh saying it but if she wanted to be with you as much as she says she would end things with her current partner - if she loves and respects her as much as she says she does she would release her and stop hurting her because it seems to me like her current gf is probably suffering quite a bit in this scenario too.

In reference to you finding someone else and you considering it, "Unlikely," what makes it unlikely is you clinging onto this old relationship. I really think by staying friends with this girl you'll just be subconsciously waiting about for either her relationship to end or her to let things go back to how they were and that's not fair on you. You need to forget her for everyone's happiness.

Home wrecker? What. I didn't even know she had a girlfriend when I first met her

I'm monogamous, obviously. And into monogamous relationships only.