It's a very sad situation, in my view. Integrity has a vital role to play in any relationship that is to endure. Being willing to reconcile is admirable, but one wonders if it's really going to work to resolve the problem.

Both of you might benefit from seeing a psychiatrist at the same time together. The problems (and there will be more than one in a friendship that has lasted for years) need to be brought up and discussed, dismissed, and forgiven--if that's called for.

One never knows what the reasons were for lying, although I haven't been convinced in life that it is ever valid to be untruthful--even the word is offensive to me. Nevertheless, some people are dishonest in an effort to spare the feelings of the one hurt. Or a friend might try to be preserving the integrity of the other one by doing what he/she thinks is best in the long run for both members of the friendship.

I'm sure there must be remnants of love somewhere in the relationship. Remember that love is kind, gentle, forgiving, never rude, bears all things, believes all things, hopes all things,endures all things. It never ends (St. Paul's Corinthians' version).

Is there freedom in both members of the friendship? Are both living independent lives and still caring or is one of the friends out of tune with the inner motivations and drives of the other?

It is complicated. Sometimes, things do not heal, and it's best to go on one's way to develop friendships with those who have a strong integrity and real concern for the well-being of their friends.

If it's a trigger for depression, I would be wary, to say the least; that is
certainly not helpful for your peace and contentment. Again, reduction
of stress is vital for everyone.

Please continue the treatment for depression until you have learned to overcome the frailty of the friend who cannot be truthful with you.

Unfortunately, one in every 25 people has no conscience; that makes it difficult to try to deal with any long-term loyalty. Only a psychiatrist will be able to identify that for you if such is the case. If your friend is a psychopath, don't walk away----RUN.

So sorry this has happened to you. Take care.