Medical student Rafaela Cotrin broke down in floods of tears at her university after learning he had been killed in a police raid on his hotel.
She wept she loved Mike, 24, as she was comforted by pals after finding out about his death from local press reports.
The pair met outside a cinema in a shopping centre in the eastern Bolivian city of Santa Cruz as he studied the show listings.
She helped him out after noticing his Spanish was very poor and they later went ten-pin bowling together.
Friends yesterday described her as being “besotted” with the man from Ballinderry, Co Tipperary in a TV interview.
They also defended Dwyer against accusations he was involved in a terrorist plot to kill president Evo Morales.
Carmen Aramayo, a friend of Rafaela’s, said: “Rafaela called me the same day Michael died and then in the university she cried several times because she said she loved him.
“Michael was a very sociable and jovial person and he dressed very simply.”
Rafaela is thought to have been with Michael the day before police shot him dead during a raid on the four-star Hotel Las Americas on April 16.
On Tuesday, two men suspected of supplying weapons to the alleged Morales assassination gang, were blindfolded and shackled for more than nine hours after being arrested.
Juan Carlos Gueder Bruno, 48, and Alcides Mendoza Malawi were taken to the Bolivian capital after being arrested in Santa Cruz.
Senate president Oscar Ortiz claimed the government had abused their human rights and Mendoza’s lawyer Denver Pedraza said he would be lodging a formal complaint.
Government minister Alfredo Rada admitted: “The arrests don’t seem correct to me. I’ve asked for a report on the circumstances surrounding the detentions and the reasons why they arrived blindfolded and handcuffed.”
Two lawyers are the latest men to be implicated in the alleged plot to assassinate Morales.
State prosecutor Marcelo Sosa has ordered Hugo Antonio Achá and Alejandro Melgar in for questioning over claims they acted as intermediaries between the alleged terrorists and financial backers. Both men have protested their innocence.
In a fresh attack on opponents, Morales warned his assassination would lead to a “popular uprising” in Bolivia.