Recently I sent a flower to a regular Forum poster just saying, hey I think you're cool. It was not the sort of message that really invited any response, and in fact, that poster has not responded. So that's okay.
But, presuming the contact is some expression of romantic interest...as a guy, I try to keep in mind that women on CS are likely deluged by such, and if they haven't the time or energy to reply to each and every one, maybe I should try fitting into their dainty shoes before I get grumpy about not getting a reply.
There may be valid reasons for his occasional absence. Or there may not be. You have the right to expect clear and consistent explanations. Ask for them. If he has valid reasons, you'll get them. If you don't, well...
All I could say is...we remain dear friends, and still love one another greatly. I guess that's about the best outcome of a breakup one could ever hope for.
I'm sorry if it sounded harsh. By "become part of the community," I meant just this: get involved, interact with others, meet people, have some fun. CS works best (when it works at all) as a sort of ongoing party, where you mingle, talk, bump elbows, etc.
And the "making no effort" part, well, forgive me if it did not apply in your case; I may have been hasty. But it's not uncommon to hear folk (of both genders) suddenly appear and say, This place sucks, all I get is scammers! when they've made no effort to introduce themselves to anyone.
RE: emails and messages
Ehh, you forgot to mention that you are new to this online dating stuff and and that you really liked her Profile.