How not to self-sabotage when things are going too well?

I feel like things are going in the right direction. We have made things official and I really like and love him and vice versa but I can't shake the uncertainty in my mind.

Like is this moving too fast?
Are we really that compatible?
Are there things I'm missing?
Why do I feel like there is something missing like in my last relationship?
Why am I finding little things to nitpick over in my mind?

Like what is wrong with me?

I have found a great guy and yet, I feel uncertain. But I know that has got to be the anxious attachment style rearing it's ugly head at me. Or is it avoidant?

So how can I stop from self-sabotaging in the relationship?

I've gone to therapy to become more secure and yet here I am being insecure again.
How not to self-sabotage when things are going too well?
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