If I particle is moved from a point A to a point B (both of which lie in a conservative force field - like a gravitational field for example), and to avoid confusion lets just say that B has a higher potential than A.
I understand that I am doing positive work on the particle - because I am transferring energy TO the particle. And in this case I understand that the conservative force must be doing negative work on the particle since $$\Delta U=-W=-\Delta T$$ where $\Delta T$ is the change in the kinetic energy of the particle, and if the particle is gaining potential $\implies$ $\Delta U$ is positive so negative work must be done.
But what I don't understand is how the force provided by me moving the particle from A to B forms a Newton 3 pair with the conservative force since Newton three pairs only apply to two particles that are interacting with each other and must be they must be a force of the same type - me moving a particle is not the same as the gravitational force on that particle (since the weight of the particle and the weight of the earth are Newton three pairs)
Are there other forces acting on the particle that link together the negative work done by the gravitational field and the positive work done by me that I have completely skipped out on? Or is my question completely wrong? Thanks!