What we resist persists. When a belief, feeling or physical sensation is stuck and just won't go away this is usually due to a lack of acceptance, underlined by fear. We resist and this only empowers and validates that which we don't like, or hate or fear. The most powerful antidote to fear is our natural ability to accept.
To accept a situation does not mean we are pleased with it or resigned to it, rather it is being ourselves without demanding our past and present experience to be anything other than what it is. It is an aspect of love.
So let's find something that we are not confronting - that we don't feel able to accept as it is - either in our past or current circumstances. The clue is fear - fear that a past experience will happen again or fear that we will lose something precious to us.
For example, I may fear that my partner will find another man attractive and that is reinforced by a previous experience when a lover did indeed choose another man in place of me. That's a painful memory that I don't want to recur.
What am I not confronting? That my partner - in the past and in the present too - does have a choice. Behind my lack of acceptance is one or more irrational beliefs or thought distortions. These lies or untruths cloud my viewpoint - I am not seeing clearly so how can I accept what is? So I need to looker deeper and in each case spot that what my mind is telling me is not helpful - really I know better. If I look honestly and drop my ego attachment...
False assumption: They have no right to choose another!
Truth: Do I have the right to choose my partner? Er, yes.
Negative thinking: I am not good enough to keep a woman!
Truth: Who says? Me - well I can change my mind about that then. Besides my present relationship is going well, it's me that's creating this idea.
Generalization: All women are unfaithful!
Truth: And all men too? What women do I know that are faithful? Erm, lots.
Heaven's reward: It's not fair, I stayed with her for years, I deserve better!
Truth: Yes, I deserved to be loved and still do, but I wasn't going to get that from a person who wanted to move on. That's the reality. I wish her well. And now I do have a loving relationship.
Intolerance: It's not OK that I am not the person she wants as a partner!
Truth: Well, my current partner hasn't said that, quite the opposite. I'm projecting the past situation, that it wasn't OK that she left. But I realize now that it was for the best for both of us. If it happened again the same would be true.
Exaggeration: No women want me, I'm ugly and boring!
Truth: That's what I think about myself. But actually plenty of women have found me attractive, including my present partner.
Try this process and I'm sure you'll find some insights that can change your life around.