<human>: Summarize the given text in a few sentences.

I 24f have been engaged for over a year and a half. I have caught my fiancé master bating a few times but he always just alt tabs so I can't see it. As of late he has been talking to a girl on his video game almost nightly. When I go to bed he shuts the door and plays his games till he is tired. I came back into the room and he was master bating instead of alt taking he shut his whole computer off... He told me he was watching porn. I could have sworn I heard him talking to someone on skype before he turned off the computer. I want to believe him, but something in my gut is telling me different. 
Should I trust him? He has never given me a reason not to.
<bot>: he plays games  with a girl on the computer, I caught him master bating. He says it was porn? Should I trust him?