Over the last couple year I've become good friends with one of DHs close friends and have helped him through a break up and we have a lot of common interests that we speak regularly about. We never meet up unless a group setting with DH and messages are strictly platonic and no attraction on either side however I've started to find myself looking forward to our messages. Part of me feels maybe I should cool it off with the friendship but we get on really well and would hate to lose a good friend because of my overthinking. Is it natural within a friendship despite the gender difference to look forward to hearing from them/seeing them? No boundaries have ever been crossed and the friendship is completely out in the open with DH. Part of me is just feeling a bit guilty about the whole situation and have not had a close friend of the opposite gender before so not sure what's normal and what's not.