Heated debate

Monday nights I go to a church group called 18plus. We usually meet to talk about and explore our beliefs through a series of worksheets and studys.
Last night was talking about mission and how it can be applied on several levels. Whats the difference between jesus' mission and the church's? Why are there differences? These are difficult questions, and were the source of some debate.
It was an issue completely off topic that caused the most heated debate. Can you love someone if you cheat on them? Anthony thought its not possible. I think its possible. Hannah thought it was more complicated than that, that it is possible to be in love with multiple people at once, just at different levels of relationship. This caused alot of debate, what do you think, can you love your partner and cheat on them? Leave comments on this post explaining how or why.