OK - you recognise that it was an error not to change the equity split at the point when your level of commitment to the project abruptly changed and exceeded your partners.
In your current situation I assume you are now drawing a salary as a full time employee of the business. Any income split between you and your partner would be on the profits - so you should get your salary plus 50% of any profit after expenses (including your salary). Provided your salary remains at a commensurate level then your respective incomes should reflect the realities of your current situation. No harm in your partner receiving a small salary for his administrative tasks - just make sure it reflects the level of work and (perhaps) industry norms.