Which one is correct and more importantly why?

Question

Infidelity is a source of conflict.

Infidelity is a source of conflicts.

Answer 1

I would use the first example, it sounds more correct.

Answer 2

Both are equally correct.

The context of what you are writing would determine which to use:

Infidelity is a souce of conflict ... between Bill and Mary. Here, you have one conflict.

Infidelity is a souce of conflicts ... in many marriages. Here, there would be multiple conflicts.

Answer 3

The first one, the infidelity is singular, otherwise it would be infidelities. Then the sentence would read "Infidelities are a source of conflict". The other thing is whether there are many conflicts, or just the one, so it depends on the content of the rest of your statement/question.

Answer 4

I'm with mysticme singular subject if you're using singular verb.  Or you could go with >>Infidelity and alcohol are the sources of many conflicts.In which case, everything goes plural.