I am in a very similar place with my husband. He just told me he wanted a divorce after 15 years of marriage. He has said the same thing to me..how he missed out on his bachelor days (we got married at a young 20), how he feels good when he's out and flirting.
there are two choices, either you play this cool and calm, and wait and let him do all the dirty work, or, you file first, and call his bluff. . .
just to let you know, my X had all those exact same feelings and thoughts. . . and after she divorced me, LOL! all the flirties were no where to be found. . . why? because there is serious flirting, and safe flirting. .
serious is looking to grab someone attention to get them to consider you for a relationship. safe flirting is flirting knowing that nothing will happen as a result, and its in good fun. .
my X has been rejected by every guy she was interested in, and is now finding relationships at the very bottom of the gene pool . . . . just to have a relationship. .
she has screwed up her relationship life and partly her work life because of it. . . I suspect that after our kids graduate from her school, she will get let go for some reason, if the same headmaster is still in charge. . .
then she will really will be at the bottom of the barrel. oh, and one more point, she is very difficult to communicate with when she has a boyfriend. . wanting me to be bad so taht the guy can feel sorry for her, . . . and if she is lonely she is pretty easy going with me. . .
so, that is the typical future for your wandering H.
good luck, but its also best to just exist as a family for awhile, while he figures out what he wants. . . and the future is very, very uncertain, so don't get all upset tyring to know what he wants or will do, as he doesn't know himself. . .
read here on two items, emotional needs, and boundaries. .
wiftty