I think I spent so many years desperately wanting people to have that feeling of attachment for me, feeling lost and hopeless without it - when actually, it's not really all that important. To quote 'Love Letter', what's important is the components of care, commitment, knowledge, responsibility, respect and trust. If you don't have those things, it's better to be without people who say they 'love' you.
I just felt like I wasn't good enough if nobody had those strong feelings, as if I was being rejected by my own species (not just in terms of sexual partners, but family and friends too). I'm learning now that that's bull, really. The strong feeling in the heart isn't some huge deal. It felt like it, to me, but I think that was more about desire for reciprocation thus helping me build self esteem. But one doesn't need it.
It took me a while, but it's been a revolution. (I actually read 'Love Letter' ten years ago...but my self esteem troubles were deep, and I wanted so badly to be deeply liked and make people happy so they get that feeling).
This doesn't need a reply so don't worry and I'm getting better and fighting. I just needed to say something to people who understand somewhat of what I'm expressing. <3 I adore you all.
(sorry for spellings, I'm dyslexic)