is my personal fitness trainer responsible....?

Hello,

QUESTION: is my personal trainer liable for an injury in his session on a new exercise which he ignored for 3 months till I had to seek medical help due to pain.

last year I was injured in a personal training session.

I was asked to train on a new exercise and as soon as I tried it I found it was far too difficult as there was a sudden pain within the first or 2nd set of reps.

for about 3 months I was in pain and though we never returned to that exercise we continued to train on that arm.

I complained every session twice a week.

I was told that it would heal or it was in my mind.

I eventually went to a chiropractor and a doctor due to the pain.

They carried out an examination and then later an ultrasound.

I was indeed injured and the extra stress had made it worse.

Partly due to the injury I stopped seeing my trainer.

It is nearly a year later and I am still in pain and it has effected my work.

I have kept my trainer in the loop since day one via phone, texts, emails, letters etc.

at no time did he say no to or discount the repeated reference to the injury in his session.

He mostly ignored me though he still owes me sessions which I have asked for in money.

Now he claims that I injured myself during a squash game but the injury is not on my squash arm and I was not playing then or since....so it makes no sense and the nature of the injury would be not possible in squash through normal play??

I respect and like the man who has helped me alot but I am not a liar and my word is my bond and he knows that I was injured in his session so.

1) why has he created this new scenario?

2) why has he only now after many months and countless updates changed the facts?

3) why has he not refunded my outstanding sessions as asked to avoid all of this as I am still his client and so keep updating him?

any suggestions.....as this is really like pouring salt in a wound which still gives me daily pain.