married men.

so I've had a friend for a long time that I actually met through my husband. this guy and I have a really close relationship. not on purpose, we just clicked. my husband doesn't mind at all in the slightest. he loves this friend and trusts that our friendship is just a friendship. I recently married my now husband (2 weeks ago) and every since I got home from the honeymoon this friend has been trying to be extra flirty. he's a flirty guy in general, some people just have that personality. but he's been.. VERY flirty. & everything I snapchat him turns into something dirty to him. I'm not sure what's going on. he NEVER acted this way towards me before I got married. does my new marriage make me more appealing to him? He's happily married.. or so I thought. if he was happily married why is he flirting and trying to make dirty conversations?! I love his wife as well, and they appear happy. He did mention that lately she hardly even wants to look at him. what do I do?? I can't just break off our friendship. do I tell him to stop? do I tell his wife? do I ask if he's having issues with her?? I should also mention that before we got married this friend talked to me, but we didn't make it a priority to talk. now he's talked to me everyday and we talk all day. I'm just enjoying his friendship as normal but I'm afraid he's thinking more thoughts than i am.