Brennan's alter ego Doug Carter shared a kiss with business partner Ste Hay (Kieron Richardson) earlier this month, but has since been unable to cope with his feelings.
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Speaking to Inside Soap, the American actor explained: "Doug has shut himself off from the world - he hasn't been showing up for work and has been hiding away from Texas, Leanne and Denns.
"He's wholly unwilling to deal with the issue at hand - that's very much like Doug - and to everyone else he appears to be slipping into a deep depression.
"What's been cool about filming these scenes is discovering the nice group of people Doug has around him."
Teasing how Doug overcomes his fears, Brennan added: "Texas comes to the forefront, as she's one of the most important people in his life at Hollyoaks.
"There's a lovely moment where she gently coaxes him into telling her the truth about his homosexuality."
Watch PJ Brennan and Kieron Richardson's recent chat with Digital Spy below:
