If he lies about little things will he lie about the important stuff?

I am now living with my boyfriend and in the beginning he told me he made a certain amount of money and told me he had just started the job he is working to help his uncle(the owner of the compan) however i found out he has been working there longer. I know we all have secrets that we dont want to share right away. However, i have not lied about anything. so my question is if he lied to me about those things, do you think he is lying to me about his feelings and his intentions too?