My ignorant self, I think with your practice you're focusing on the idea that you need love, preconceived non-existent wants and needs. Maybe you've let others in the past and now yourself gaslight your own that you're abandoned, have issues and don't have what it means to be fulfilled and happy. You're choosing to deny the reality that you are enough, and attracted someone who thinks that way into your life. I like to think that the fact of she's out of your life is a blessing and opportunity to grow by pondering on it.
From the Buddhist perspective, these are just thoughts. You can analyze a problem like some old childhood trauma and and think about it, but in my experience, another thought cannot fix the problems caused by previous thoughts. In my experience, there are no resolutions in life. Resolution is just a word. What does it mean? I think trying to uncover hidden traumas and trying to resolve them is like running round and round in circles.
This is my perspective as someone who looks at life through the influence of Buddhist ideas. I'm certainly not all-knowing. I've never been through therapy, so my ideas of therapy could also be wrong.
It's not a thought that was recommended which you didn't quote. It's the same kind of meditation as Metta meditation. What's called Metta is in the 117 focuses of the same meditation style(as far as I know Metta jumps between couple of these), and most practices use these to unlearn certain habits and form new ones for different situations. People hit plateaus in their practices, that's the time when this kind of practice is used to not run round and round in circles.
Traumas and the identity of a person are not thoughts nor ideas. An apple is not the apple tree, but it can become one. These are strongly rooted in your subconscious and are not active most of the time. Something needs to trigger and light them up. Thoughts' bias come from these pre-learned and pre-formed structures in your brain like weighted vertexes. As you don't trigger them, they fade away and you're like a newborn. Even the situational need of letting go does trigger and make them more permanent.
Buddhist practice focuses on letting go of EVERYTHING, so that nothing can trigger these things. Daoism is somewhat similar. Me and some other people are not that loyal to Buddhist practices and didn't let go of casual life like monks do and can't benefit what they say just the same way they do. If anyone could, Buddha would not abandon things.
If the purpose of Buddhism is the identity of Buddhism itself, I would be holding on to something and it's ironic to think that way. The skepticism is not about Buddhism it's about our own ego. Buddhism nor any practice doesn't exist in reality. "Saints has no religion." is what a saint said. After Buddha, in this era how much the milk got spoiled after the cow became distant to this world is pretty problematic and not accurate from what I concluded after reading Suttas. Becoming Arahant you become Independent of anything and people focus and become defined by this adjective at some point to achieve it.
Which reminds me of the book of Torah, I want to quote the "God" says it's name is "I am that, I am." Everyone at some point need to go beyond letting go of what arises, and realize and purge what never passed away by becoming themselves.
What do you think about this? I really benefited and learning a lot from our forum, thanks to Matthew, with lots of love.
Addition: Another thing to note is for most of the practices to effectively work, you need to be young. Your brain structure needs to be elastic to let things really go. To benefit the Buddhist and other practices you need to start when you're young. Even 20 years old is late, for someone over 20 years old, it's hard and if you can't compromise too much about what defines you, it's might be waste of time and not logical just thinking couple of hours sitting will get us far. Quoting a Zen master, Suzuki Shunryu, it's not desired for someone to start practice late, some masters wish some students started earlier.