Resolving to be angry when things don't go your way or having a resentment towards the situation or the person involved, will only result in you not having a peaceful heart.
Whoever fault it was, you need to be accountable for your own thought and action for your own well being. It might hurt you to realize that you're only at the lowest of priority for someone that you actually had a good interest at heart, but reality is reality. Accept it for what it is and forgive yourself for making your own life miserable by putting too much expectation on another flawed human being like you.
A balance mutual relationship (friendship / family/ colleague etc.) should happen with shared value & common understanding. If all efforts have been tried out and things doesn't happen the way you planned, remove yourself from it & evaluate. Be calm. Think.
Perhaps the solution is by having the distance to create enough space to forgive and to let go for the best interest of both or more parties if involved.
This I wrote as a reminder to myself and foremost. To whoever reading this, may you have all the love you need and may it be a blessed one ❤