Am I a bad friend for this?

I have a small friend group, there's only 7 people in it and 2 of my friends like eachother. I really don't want them to date because I feel like it could split up the group. I also feel like the girl would take advantage of the guy because he doesn't know better. If they date I kinda hope they break up. I also think the girl is using him to get to prom...
Last year our group used to have like 12 people and then two of them dated ( different from the people that like eachother now) and broke up. It broke up our group to the seven that we have now and we don't talk to them anymore. I'm just afraid that history will repeat itself. 
Am I a bad friend for not wanting them to date/ break up if they do? 

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