There are 127 films with the same actors, 21 films with the same director, 48840 with the same cinematographic genres (including 7935 with exactly the same 2 genres than Love in Quarantine), to have finally 70 suggestions of similar films.
If you liked Love in Quarantine, you will probably like those similar films :
As described in a film magazine review, Thomas Maughm (Elliott), a Wall Street broker and unhappily married, finds himself in love with his secretary Mary Moreland (Rambeau). He confesses his love and she leaves his employ. After Mary has traveled around in various positions, she returns home. She learns of the death of Thomas' wife and this time she listens to his confessions of love.