CO, you've been advised well.
However, you still have the final say where your choices are concerned.
Based on what you've shared with us indicates that, you weren't prepared mentally or emotionally for the break-up, the way it was done, OR the shock which ensued by the behaviour of someone who 'seemed' so warm, but turned out to be so cold
So, while you envisaged the future with this person, they were busy calculating and/or making plans of a future without you - ergo, the feelings of love continued - albeit one-sided.
Love, and Fear of repetition, is clearly the inner conflict that needs to be somehow reconciled.
And in my opinion, FWIW, I say go for it.
Because on one hand, you'll be able to pacify your mixed feelings of yearning, torment, frustration and loneliness, while on the other hand you'll be able to secretly come-to-terms with your resentment for the way you were treated - as well as your disillusionment of this person.
In the very least, you'll be
prepared to say goodbye on YOUR terms or when/if the moment comes around again.