The actress, who was also Monteith's "Glee" co-star, had requested for privacy, post his untimely death in a hotel room in Vancouver July 13.
Michele took to Twitter to thank her fans for showing support, reports dailystar.co.uk.
She posted an old picture of herself and Monteith, with the caption: "Thank you all for helping me through this time with your enormous love and support. Cory will forever be in my heart."
Monteith was found dead in his hotel room. It was later revealed that he died of an overdose of a mix of alcohol and heroin.
Montieth was in relationship with Michele for almost two years.