When I was interviewing, I was very excited to join this company.
My resume tells I am a job hopper, they told me why should we hire you?
I convinced them, but I explained why I want to change during interviews.
Therefore, the conditions that encouraged me to leave the previous company should not be the same in the potentially new job.
When I was hired, I've been in a period of uncertainties: I was supposed to be staffed with a week or two, but the involved company didn't accept me, so I was inactive for almost three months.
When I finally was staffed, the manager on site didn't make a good impression. He didn't do the necessary to make feel welcome (like how to make your badge, he is your perimeter of intervention, what is your responsibility ...).
I was in the dark for a 3 or 4 weeks, and, while I was idle, he revoked a permission to attend a training session organised in HQ.
Later on, I had a casual conversation with a colleague, whom I told I am doing absolutely nothing, to which he replied that the guy I replaced was also doing nothing before he resigns.
This caused me an insomny that evening. The next day I told this colleague I didn't sleep.
Somehow, this colleague transmitted this to top managed (maybe he is familiar with them), and suddenly my boss's boss came to me and asked how I felt in this new environment (we were in a closed room).
I told him I didn't like here, and, at the same time, I was thinking I was going to be fired or something (out of pessimism, maybe).
He then convoked the manager and told him that he needs to do the necessary to "welcome" new people etc.
Now, I am doing better, I am working on something, but the rythm is very slow.
Meanwhile, when insomnia hit me, I called a previous employer and triggered a hiring process.
Now, I am having an interview with my previous employer who is ready to hire me back.
Is it legitimate for me to leave under such circumstances, or are they not going to understand my reasons for resigning?
Update:
We are 2 on the task I am working on. My colleague, who is old enough in this job, has been setting up meetings and kept me out of the loop.
I tried to talk to her today, and she became cold lately.
She talks on a daily basis to an architect who doesn't answer my emails, but answers others (when I am CCed).