an applogy email 2

I need to write a very good professional email for a company .. the situation was the following :I was working in company A in a good position, company A is not very big company I got an offer from company B (a very big company) but a smaller position for the first 3 month then evaluation then may be promotion or not ...I spent many days thinking and said ok to B and kind if tell company A that I was leaving , company B waited for me but company A treated me in a very good way that made me change my mind and send an apology to y B who was at that time waiting for my arrival in less than a week so they must got the wrong impression any way I contacted the manager of company B and apologize to him in person and stayed in company A hoping that with time it will grow and I will keep my good position what really happened is that after 2 month of that situation problems start happening in A things are not stable , No future and I think I might even loose my position so as difficult as the situation seems I need to email B telling them that I was really confused and wasn't thinking clearly . if they still offering a position I'm welling to take it , I can sign a contract right a way my situation in B is really weak they trusted me but I didn't come(it's true that I did apologized) but still it was bad , so if I was them I wont hire me but what I have to loose , may be they will think that if A did all that effort to keep me then I must be good (and I am btw) I also need to highlight the fact that a big part of my hesitation was my position in A if B offers the same position then there wouldn't be any hesitation , I'm talented as a project manager . I was really going to join company B but my manager in A who offered me a position that made me more confused plus I was working in a project that consumes more time than it should and I had 2 stay 2 finish it , it was an emotional decision ## Deliverables h ## Platform any