Apariencias (2000)

Carmelo, who is 30-years old and extremely shy, finds it difficult to reveal his innermost feelings to Verónica, his co-worker. Carmelo's world collapses when he finds out that she intends to get married soon. Accidentally, she spots him demonstrating in a gay rally where he becomes a leader of that cause. Of course, Verónica assumes that Carmelo is gay, and he takes adv antage of this misunderstanding.