Is he cheating?

Mercy

I’ve been dating him for almost 2 years now and he never allows me to have access to his phone. The excuse he’s gives is that ‘our phones should be off limit’ ..... he doesn’t even ask me for my phone at all just because he doesn’t want me to ask for his phone too. When he wants to type his password he’s always looking at me to ensure that I’m not looking. Also when I tell him to give me when I need to make a phone call he doesn’t give me, he will rather give me his small work phone..Should phones be off limit when dating? Is he cheating? Should I continue this relationship?