i was thinking of a way to sort of test relationships.
when you arent sure, or need reassurance, say this:
serious face " i think we need to break up" or some break up line.
after a couple seconds break into a smile and say it was a joke.
now this is a bad joke, i know that.
but if you take her reaction into consideration, first her mind will go blank and if she thinks of how much she would miss you, once you tell her it was a joke, she'll criticize you but she'll be hyped up on emotions of how she thought she almost lost you.
in most cases she'll go silent, and she also might be relieved that its over, it encourages her to break up with you sooner. which means you can move on because it wasnt going to work out in the long term anyway.
how about it?

it doesn't sound great, it's pretty negative and will surely lead down a negative path and plant doubts in her head about the relationship that may not have been there previously. I don't think that you should "test" a relationship in such a way, you should be able to tell how it's going just by being in it.

Take this as constructive criticism: If you are actually in a serious relationship, THIS IS THE WORST IDEA EVER. You're f*cking with her emotions, and she will be pissed off.

However, this IS a good C/F line to use while in push/pull after you just met (along with breaking off kino). It's funny then because there isn't anything to break up since you two aren't a couple at that point. Make sure to use it in the right context.

As tmg3 said, you should know where your relationship stands without having to ask the other person outright.

If you "need reassurance" in yourself, you're not going to fully get it from your relationships or from anything else external to you. Read Shambhala: The Sacred Path of the Warrior by Chogyam Trungpa

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Live Your Truth.