As a person who is on the fast-track to becoming 'old, alone and miserable' I think I can safely say that it likely won't happen to you.
As for the rest of your post, a lot depends on what medium you're referring to.
If you mean here at GA then I would say 'People go through a period of time after confrontation, no matter how minimal, to regroup and consider. There will be some distance, initially, after which things will more or less go back to normal.'
If you mean real-life then I would say 'Unless there is something you know to be inherently flawed about your character, you should continue on as you have been, remaining true to yourself and your beliefs. No one can honestly say they themselves do or say only the right thing 100% of the time. When you do find your *someone*...' And I believe you will. '...They will love you completely, despite - and maybe even because of - your flaws.'
You wake up each morning because, whether you know it or not, you are the bright spot in someone's day. Remember what I told you about smiling. The statement 'people are rarely what they seem' is true on many, many levels - some of which you probably don't even know about.
The risk of being abandoned is a huge and frightening thought but if you sequester yourself from others you will have guaranteed it to happen. Strength lies in getting back 'out there' when you've been let down. Regardless of how bleak the situation seems at times, everything changes. It's the nature of the world.
Take care, Tim.
Dion