The reality TV star has full access to Falcone's messages after discovering earlier this year that he had been contacting other women, resulting in them briefly separating.
Despite keeping a close eye on her partner, sources say that Mecklenburgh is still inundated with claims from "wannabe glamour models" about her partner's infidelity.
"She gets really upset" they told Heat. "She loves Mario like crazy. There are loads of wannabe glamour models who come back time and again.
"But she does love him... Lucy's said, 'If someone shows me a text that makes me realise I'm being naive and silly, then fine'.
"But she trusts him and she's got access to his Twitter, phone, the lot."
Falcone proposed to Mecklenburgh during filming of TOWIE's Marbella special, which aired in June.
The couple first admitted to having trust issues last year after Mecklenburgh cheated with ex-boyfriend Mark Wright.
The Only Way Is Essex returns for a new series on ITV2 later this month.