"Roland, my boyfriend cheated on me and now he says he's sorry.
Should I trust him?"
Not good. I wouldn't trust him. Find another boyfriend. Or better yet - work and study, become solidly established, perhaps with your own business, so you don't need a boyfriend.
You deserve better.
The word boyfriend always makes me wince. I believe in courtship and marriage, not causal dating and living together. I wrote about the difference in a chapter in my book The Myths and Mysteries of Marriage.