How can I break up with my GF without hurting her? We've been dating for 3 years now and I want out cause I'm no longer happy.

You can't do it without hurting her but it would hurt worse to stay with her only because you are afraid to be honest.

Agreed. She will be hurt. She might even suspect this is coming soon? You can't fake being happy in a relationship. Well at least I couldn't.

You can not do it,
The best way is to be honest, direct and get the break up done and over.
After the break up, don't try to be friends, don't try to talk to them,
Go to no contact and get over it, and let them get over it

Guys its very difficult because she really cares about me and I don't know where to start.

Just tell her, say, it is just not working . If you want to use the cowards way out, say we need a break, then of course they expect you to come back.
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But they will cry or they will curse, or may do both.

Same woman?

https://www.askmehelpdesk.com/mens-health/impregnating-729303.html

Start with honesty, tell her you aren't happy and want to leave her. All break ups hurt whether you want them to, or NOT!

Tell her you want children and since she hasn't been able to conceive...

Is this the lady you were trying to impregnate? Good thing she didn't get pregnant.

Is this the lady you were trying to impregnate? Good thing she didn't get pregnant.

That's the reason why I want out cause she got a child, and now I have to play daddy with another man's child. I can't do that I rather find someone Just like me.

Just say it gently in a suitable environment. Good luck.

Thats the reason why I want out cause she got a child, and now I have to play daddy with another man's child. I can't do that I rather find someone Just like me.

At least you are being honest which isn't a bad thing at all.

Thats the reason why I want out cause she got a child, and now I have to play daddy with another man's child. I can't do that I rather find someone Just like me.
Did she have the child when you met her? Is that why you were trying to impregnate her?
Just be honest and leave. I'm sure she would not want you knowing you feel the way you do. I know I wouldn't

When you break up with her, make a clean break. No texting or calling. She needs to be able to get over you and move on. That won't happen if you two are still communicating.