I think it would depend on what his intentions were. If he wanted to share in my delight in a hobby with me every now and then, then great! However, I had a partner years ago who wanted to come to my book club with me because it was 50%male (unusual I know) and he said he was worried I might run off with one of them. Not interested in reading any of the books (I'd have loved discussing those with him)...just about control and his insecurities. So - if it's about wanting to share occasionally - absolutely, but if it's about insecurities and control - absolutely not. He's an ex for a reason..