The Past.

It strikes up everything. Don’t ever use someone’s past against them. You’re just reminding them of the mistakes they made back then. If you can watch their facial expression carefully, then you’ll see the hurt in their eyes as they reminisce everything that happened. Never use emotion as a weapon, it strikes deeper than you can imagine.

Manners matter. 
Good looks are a bonus. 
Humor is a must.

Different people do the same thing for you, which would make you feel extremely different. Because what you care for is not the thing, but rather for the person who do it.