My girlfriend is always talking to other guys to make me jealous, I think another break up with her.
Just because your girlfriend talks to other guys that shouldn't make you jealous right off the bat.
But I'm a cold-blooded person. And I'm not in love with her.
Well, if you are not in love with her you might as well break up with her. Otherwise, you will be forever jealous of her and that would be detrimental to your mental health.
You should kill people who you are jealous of and not have to deal with this shit.
Your last response is a little extreme, I would not recommend saying that. If this is affecting your mental health that much I would recommend you seek professional help.