If someone has a problem, yet refuses to discuss the problem with others, so getting help, they are said to have bottled the problem up inside themselves.
Keep to yourself
You can figure this out if you think a bit. If something is bottled up, it's trapped and not released. Bottled up emotions are held in and not released.
It means to keep them inside, like closing them up in a bottle and not letting anyone see your feelings.
Bottled Up - 2013 I was released on: USA: April 2013
Think about putting something in a bottle and putting a cork in it. The idea is that you are putting your emotions into a bottle and not letting anyone see them, or not letting yourself feel something negative like anger or grief.
Bottled Up - 2013 III is rated/received certificates of: USA:R
The cast of Bottled Up - 2014 includes: Emma Lillie Lees as Girl
Bottled Up - 2013 IV was released on: USA: 12 April 2013 (Occidental College)
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Seedlings - 2013 All Bottled Up 1-7 was released on: USA: 30 May 2013
One should not let his or her feelings get "bottled up" because bottling up one's feelings can lead to a very stressful life where one is always on the verge of a melt down.
Water. If you buy bottled water that is not properly reverse osmosis filtered you can get up to a few hundred extra unwanted chemicals.
You tell him that it's okay if he is and try to make him feel comfortable about saying whether he's gay or not. It's unhealthy for someone to keep something like that bottled up.