Hanging out with ex-gf's friends

I feel sad for our friends who got caught in between me and my gf's break up. Technically, they were her friends until I got introduced to them. We've made our own bond and I now consider them as my buddies too. I've talked to one of them recently and he said he missed the Sunday bbqs at each other's houses. He said he wished we could all all hang out and none of it (our break up) would matter.

I don't like the feeling of burdening people with the events of my life. I told him we could all still hangout if she's (my ex) already comfortable with it. I think the last time we all hung out was during the new years party dating service celebration we had early 2018. So my friend said he'll plan a day for us to get together again. Was I wrong to say it was fine to hangout with them? They were her friends first not mine.