So, the story is as follows:
I worked as a sysadmin for a year at a company, and one of our clients asked me to rewrite some application for them. I initially said yes, but didn´t sign or anything, and I was supposed to do it on my spare time.
Fast-forward to today. I have since left that company, did some work on the project, and landed a full-time job somewhere else, and I now want to pull out of the project. Given that I haven't signed anything regarding that project, how unethical of me is to just say I don´t want to do it anymore, hand over what's done up to this point, and just leave?
Edit: I guess what I'm most worried about is tarnishing any reputation I might have left with my past employers (they weren't too happy with my performance), and any consequences (they 'threatened' me saying they'd wash their hands off if anything went wrong, as the project was funded with public funds). In any case, I reiterate, I haven't signed anything.