Confused =/

When you truly believe that you've lost someone that means the world to you, it's very hard to convince yourself that you've got them back. And maybe even if they are back, how are you supposed to feel confident that that person will stay in your life?
It is possible. I know it is.
But building that faith back up is hard. I guess when something happens so repeatedly to you one of two things comes of it.

You get used to it.

or

You become hyper-sensitive to the situation.

Neither is good and I probably don't need to explain which of these conclusions I've fallen into.
My point is I'm confused. I'm happy and in love. Also hurt and feeling lost. For some reason I don't feel I can ask for help on this one either. I'm afraid it would do more harm than good. Anyway, I've explained how I felt a number of times. If you're saying how you feel, stating a problem, being honest and blunt and people still don't grasp the seriousness of the situation.... What's left to do?

This isn't meant to impress anyone. Sorry I haven't written anything very good in a while. I just needed to get some thoughts out.

Sometimes I freak out.
I obsess over stuff that isn't real.
Sometimes I get jealous for no reason.
I come up with scenarios and psych myself out.
Sometimes I think people are thinking something they aren't.
I'm probably wasting time and energy to things that only exist in my head.

But what if this one time, there's actually a problem?