Do gay guys flirt with straight men?

I’ve had suspicions in the past of my boyfriend being gay or bi sexual however he has always denied this.
For the past few months I’ve noticed gay guys hitting on him when we’re out together.

Straight guys - have you experienced men flirting with you?
Bi/Gay guys - do you flirt with straight men or do you feel you only do this when there’s a vibe or sense the other person is gay?
Do gay guys flirt with straight men?
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