Does not loving each other call for faith of sorts? What is trust?

Two very different questions. For the former, no love doesn't necessarily imply 'faith' (it doesn't for me) - it's an attachment based on strong human empathy, attraction and compatability - and even emotional dependency at times. I have NO "faith" in love - but nevertheless it seems to endure..

What is trust? Umm, a basic need if you're tiny, so it comes as a default setting in response to certain pre-programmed key triggers. Otherwise, we trust what we learn to know doesn't kill us. Basic empirical pragmatism.