ex messages me. do I tell my boyfriend? it is considered cheating? SOS

mady
My ex is messaging me but it's friendly. Is it considered cheating that I answered and have been talking to him? He's helping me with some of my mental health issues but I feel bad about it. What do I do? Do I tell the boyfriend? What do I say? He'll be mad and I don't want to loose him. 
UPDATE: I told him. Obv he wasn't happy and kinda flipped out and after I explained why, yeah he's still mad. I deserve it though 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors