The best advice:
Talking about breakup up in heat of the moment is wrong. One should rather avoid talking about breaking up altogether. Avoid discussing about any break up your friends have. Do not focus on any negative. Focus on positives.
The most interesting advice:
Observe your partner in all his/her transactions, discussions and work with others. If he/she behaves in a deceitful manner or does not care about small lies then be careful. A person’s character remains the same. A person who is today behaving differently with you than he/she behaves with others can one day behave the same with you also. Her/his essential and true character will surely reveal one day. Better not wait for that day. Break up as soon as possible rather than getting cheated in future.
The worst advice:
What if you meet somebody and get attracted? What will happen to your existing relationship and what should you do? Write about what would happen to you, your existing partner and your future partner. Study the consequences carefully and then decide. If you tell your existing partner about your attraction it would make your job much simpler. At least you will suffer less from guilt.