Well I think if you really go out with someone for quite a long time you do get to know each other very very well you go through the good times you go through the bad times. You know both personally but also within a relationship as well.
If you're a Christian you don't sit there and worry about what somebody else is doing if they're happy and they're committed in a relationship.
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I have a love/hate relationship with just about all technology in my life. My first typewriter in particular. I had a helluva time putting new ribbon on it.