How do I conquer my insecurities?

My boyfriend and I have been together for two years and have lived together for a year. He's talked of marriage but I'm facing some fears...insecurity and trust. Been married before and engaged, which were not healthy relationships at all but now my new boyfriend is THE BEST...truly believe he's Heaven sent. My kids adore him! I love him dearly; yet, I'm afraid of being hurt again. He really hasn't given me any reason to feel otherwise. He's mostly home with me and is very attentive to all of my needs even if it means going out to the store 2 o'clock in the morning to get me something. That is something I'm not use to. �The other two were abusive in so many levels. And i will honestly say I have been giving my boyfriend such a hard time and it's not right. I fight to keep my insecurities to myself but they seem to resurface. I never had any notion or gave it a second thought that the first two would be unfaithful or be so abusive...giving 100% of myself to only be hurt. �How do I conquer my fears of being used and abused? Also I'm getting ready to move out of the state due to personal reasons and will be staying with my mom, and he has made it known that he wants to come later...get a job transfer and get married. He's all for premarital counseling and I definitely don't wish to go through another divorce.�Yes it's costly monetary wise but it weighs heavily on the mind, body and soul for the adults and children, and that's also very costly.