"it was my daughter who said it was ok to go round maybe he didnt want i really "
This^^ is what I think. Not your fault. DD should have discussed it with him before she said yes. But I take it neither or you were used to her having a man in the house. Imo, everyone needed to adjust. Sorry they didn't realize that.
"i just said like hey calm down like theres no need for that "
I get why you said this^^^. He definitely seems to have overreacted. Unless he has asked gd to be more careful before and was reacting on that basis. It probably would haven been better if you hadn't tried to tell him how to act, but I'm sure you realize that now, hindsight is 20/20.
"notanan mentioned that i didnt sound like nan i sounded like a parent
and in alot of respects thats true."
Yes, I take it that in many ways you've been like another parent to gd. Plus, you say you're used to helping out with the discipline with all your gc and their parents welcome it. So I can see where it felt totally "normal" to you to step in when you felt bf was being too hard on gd. I really feel you were just being a loving gm doing what she's used to doing - and suddenly, it backfired on you! I am so, so sorry!