Now Cass, trust is another thing completely different here. Trust MUST be earnt, not expected. You have started a new relationship Cass, why exactly are you suppose to trust him immediately? You don't know him well enough to trust him, so why should you be dishonest with yourself, or him, that you do at this point? This is a negative emotion that causes your pain. Instead of just saying, you must earn my trust Luke, you do not get it the moment we sleep together, instead the moment you have interpreted sex with trust... not a good combination. That is if you have had sex... just a presumption, not fact. I use that as an example only Cass, not necessarily your exact circumstance. The example I raise is because this is the typical model taken, ie. we have sex so we believe we must trust, when in fact the two are very different. Sex is pleasurable, and whilst it comes with giving a certain amount of ourselves which is associated to trust, the other person may not see it this way, and even if they do, they still do not necessarily warrant immediate trust, because trust comes from knowing a person over a period of time, using best judgement of your experience in life to apply whether that person can be trusted. How that person interacts with you, and any feedback gained from his friends or family, vibes even for a word, your feelings you get from others about him. If you speak with others, and feel they are stepping around words carefully, ie. not being open and honest about him, then something is often being kept, so how could trust really be present yet? It can't, nor should it be expected.
The moment someone says marriage, then you could presume a certain level of trust is then present, but even that nowadays can be misinterpreted by many, because the other persons view point is never consulted, just assumed.