Ex wanting to get back into my life....

So out of the blue my ex tears me this .... 
Now mind you. I have a BF already and we have been dating for 5 months and I feel like I should tell my BF that he texted me. But I also want to tell him it's to late I moved on and I don't think my BF would appreciate you texting me. You messed up and I've moved on. So my thing is ... should I tell my BF and then delete and block my ex number or don't tell my BF and still delete and block my ex. And me and my current BF he lives 6 hours away from me. So I only get to see him sometimes. But I care about him so deeply that I wouldn't want any secrets between us and I feel like he should know. So should I tell him ??