I think I'm getting ignored intentionally by my boyfriend. What should I do?

Hi, first time posting on reddit for relationship advice, but I really need to know what to do, and I don't want to ask people I know because I'll get biased answers.

Me and my boyfriend have been dating for about 6 months. We live about an hour away from each other, so we text more than anything. At the beginning of our relationship, we texted and called almost every night. But after a while, he always seems to have excuses on why he texts me MAYBE once a day. Ill get left on delivered from noon until the next day, and say he's been sleeping, or his phones been off.

I also know that he cheated on his last girlfriend, but he swears "I'm different" and that he wouldn't do that to me. What should I do? Should I talk to him?