Ok, so let me understand
You have an idea that you worked on and because you needed some money you gave someone else 49 points in your invention. Or, 49% of the profits made from that invention if and when any are ever made. Now, you need more money (or services) to keep going.
You can look at this 2 ways.
One, Think of your idea as just that, an idea and if/when it makes money 49 cents of every dollar are going to this investor. Although he’s entitled to the money, he doesn’t own any rights to the invention itself, or any other inventions you may create in the future..
Second, you think of your invention as a company and your friend as a partner so you own 51% and he owns 49% of the idea, the company, and anything ever developed under that company.
You first have to know what one you think of this as, and what he thinks of this as…..
If he is an “investor” you have 100% (points) left to offer anyone you like in share equity. However, if he is a partner, you and/or he would need to delude your shares to make room for a share equity partner.
Hope this helps