Can’t trust bf?

I haven’t had trust issues before this guy but the whole 2 years we’ve been together I feel like I can’t trust him. Just some sketchy stuff happening i think I’m overthinking because he’s been cheated on and he’s scared I’m going to cheat. But sometimes he makes me question his actions. Tips on how not to be so jealous and overprotective? How can I trust him it’s creating issues in our relationship