It is often said that time is the healer. However, few realise that time itself cannot heal anything, including a broken heart. The answer and the method to heal everything lie in time.
You stated that the relationship ended, but did not provide the reason. However, in subsequent communications, you indicated that you no longer trusted the other party. Was the initial separation also due to a lack of trust?
The optimal emotional state between two individuals is mutual trust. In the absence of trust, the relationship can only be described as "suboptimal." If the relationship is suboptimal, it is not advisable to become overly invested.
Your sense of inadequacy is a direct result of your own abilities. You are aware of this, so why not put in the effort to improve yourself? There is nothing wrong with staying within your "comfort zone," but it will not lead to advancement.
Perhaps you have encountered numerous articles of this nature over the years. What you recall is not the individual in question, but rather the sense of crisis in your confidence that she instilled at the outset. This memory is particularly vivid. After reading extensively on this topic, I will offer a different perspective. Perhaps the emotional insights from psychology will have a slight impact on you.
There is no forgetting her. Have you come to the conclusion that everything you once gave was a joke? Is your sadness and unhappiness because of what happened, or because you feel helpless?
Life is akin to a train journey, with the destination being of secondary importance. What matters is the scenery along the way. In this life, we will encounter numerous individuals, some of whom will bring us joy, some will teach us a lesson, and some will provide us with experience. No one will always be there for us, but someone will always be there for someone else. Since she got off the train halfway, it would be prudent to bid her farewell and relegate the disagreeable experiences to the deepest part of your memory. It is sufficient to remember the positive aspects.


Comments
I understand how you feel, it's tough to move on especially when the memories are still so vivid and strong. Maybe it's time to allow yourself to grieve and then slowly open up to new possibilities.
It sounds like you're carrying a heavy burden from the past. Finding someone who appreciates you for who you are can be challenging but not impossible. Trust will come with time as you heal.
Focusing on your career could be a great way forward. It might give you the confidence boost you need and help you realize your worth outside of relationships. Take one step at a time.
The pain you're experiencing is valid, but don't let it define you. Consider talking to someone about these feelings; sometimes just expressing them can lighten the load and bring clarity.
Songs do have a way of bringing back memories. Perhaps you can use this as an opportunity to reflect on what you've learned from that relationship and how it has shaped you into a stronger person today.