my sister, I understand your dilemma, especially the lies and trust issue. there is nothing wrong with marrying before. the only problem is lying about it, and even denying it. My advice will be do not trust this dude again, If you love each other, with time , hopefully you'll learn to trust him again.
This guy committed a serious crime- selling drugs near a school. As if that was not bad enough He had a gun with him. With good behavior, he might be out in 120 years. Either way, his sentence Was life .