I think the following will help - it is arranged into 8 rounds if you need it.
G1 G2 G3 G4
(A B) (C D) (E F) (G H)
(F H) (E G) (B D) (A C)
(B C) (F G) (E H) (A D)
(A F) (D H) (C G) (B E)
(D G) (A E) (B F) (C H)
(C E) (B H) (A G) (D F)
(D E) (C F) (A H) (B G)
(G H) (A B) (C D) (E F)
As each teams plays 8 times and there are only 7 possible opponents, there must be some repeated pairings. These repeats are confined to the first and last rounds, or putting that another way, every teams plays every other team once in the first 7 rounds. If you only have 3 games, then assign the G4 column to be the byes.
Hope that helps.