Relationships Suck

My partner went to Lombok with some Dutch guy last weekend. He didn’t tell me anything about it and pretended he was at home in Bali. He lied when I confronted him with what he was doing in Lombok. He chose the wrong hotel to stay at. I know the owner and his partner of the place they stayed and another good friend saw them there and told me. We have an open relationship which means casual sex. To spend a weekend with someone, fly together, eat meals together and all that shit isn’t casual sex. I was fucking furious about that and the fact that he kept on lying about things. I am also a bit disappointed in him too because he knew I knew the truth but he kept on telling lies. So I was single for a few days. I gave him a really hard time but couldn’t ignore him. I wish I could have actually. He is doing this for money he says. That I don’t like very much either. He is turning into a money boy? I give him money for things but I am reluctant now after all that happened last weekend. He also has a visa application in so he can visit Australia with us. It’s becoming protracted as he told me last night the embassy are asking for other documents. He is supposed to come to Sumbawa after the visa is done. But I don’t want him here at the moment. Is he telling the truth? Trust is a big issue. If you don’t trust someone should you stay with them?