Thanks for reading Drew!
Yeah, Dan's life after the death of Alex is to raise Mattie, but I would hope that even though Alex was special and very important to Dan that he would eventually fall in love with someone else. If I was going to continue this story I would HAVE to have a happy ending for Dan, but since I'm not, lol.. We can only hope that if we knew a Dan in real life (wasn't that the title of a movie?) or a person in Dan's situation and time in life would find someone else to love.
He did come out, it wasn't put into any detail, but his Mother knew that Alex and Dan was a couple so... that's the only thing I supplied for any word on his "closet status" lol.