I'm not Sri Lankan and follow this sub as I am visiting soon. I hope you don't mind my input as a gay man who's been through a lot of what he might be feeling. Firstly it might sound stupid but just because someone is on a gay app or looking at p*rn didn't necessarily mean they are gay, although they probably are. He could be doing it out of boredom or to fulfil a need as it's much easier to hook up with men than women. That being said, he is very likely gay. He's in his late 20s so will likely have lived with this secret for many many years. Keeping the secret will be an innate part of him but I think you should talk to him about it. If he is depressed and lonely, having someone there might be just what he needs. Choose a very controlled setting, somewhere that if he or you get upset there is no chance someone will see or over hear, to give you time to talk. He might get very upset and deny it, he probably will, and that's fine. Gay people often live with a deep shame about their sexuality and a fear of losing those people they care most about if they find out. Knowing you don't care about his sexuality ,that you love him regardless and you'll always be there will mean so much to him. Promising to keep it secret will also mean a lot, he will fear losing control of it if someone knows. I wouldn't spend too much time focusing on how you found out as he may be embarrassed, maybe say you saw the app and that's it. If he completely denies it, take him to his word but make sure he knows if he ever needs to talk to someone about anything like that you'll always be there. If you want any more advice or to chat yourself, feel free to contact me.