[mahyarm]

You shouldn't of felt bad about expensing business expenses. If the company pays for it, it's with before-tax money. If you pay for it and doesn't get reimbursed, it's with after-tax money since your an employee. If you felt bad about charging the company, then offer some of your own money in exchange for equity to cover the expenses, especially when a startup is just 3 other people. I think that way it will be still be a pre-tax expense. I'm not a accountant so ask one. If they are not willing to do that when the company is at that stage, then that is a big warning signal.

Since people out of the company can have their stock diluted to nothing, and you are on bad terms with the founders, I would suggest the business expenses you still have records for instead 3.5 months of equity.