need some advice

Jessica
Me and my boyfriend have been together 2 1/2 yrs and I did something in the beginning of our relationship and lied about it for a long time he got really upset about it and now he always thinks I'm lying and seeing other men or talking to them and I dnt know how to get him to trust me I learned from my mistake and never want to hurt him again and I just found out I was pregnant 3 weeks ago