Meeow!
Like any phobia, you need to islolate the specific fears (what do you think will happen if you are committed?) and then expose yourself to them in a controlled manner over time. Our fears are almost always worse than the reality, the phobia loses it's grip and becomes more manageable.
Often it's risk avoidance, a sensible response if you've been burnt in the past but ultimately counterproductive. You may not get abandoned but you end up alone.
It really helps if, like Merika, you can find a way to be happy alone. That lessens the risks you take in relationships, you can love well because you know you can survive it's loss.