The Sims 3 - Relationships?

I have this girl Sim named Pixie, I really want her to have a baby, but to do that she has to meet the right guy. I go to The Red Rendezvous everyday to find a cute guy. I met a really cute guy who has all the same traits as me except instead of dramatic he has natural cook. So anyway, I got to the best friend stage just so I could learn more about him and I found out everything there is to know about him. I asked him if he was single and it said he was like engaged or married to some chick name Silver. I just wanted to know if there is anyway to break them up, I want to do it without a cheat. and I don't want to have to play as him and break up with her either. thx, <3. And btw, My name on here is Derek but that's cuz I'm using a friends account, I'm really a girl. Lol ok thx, bye <3 <3.