It is not wrong to flirt so long as your definition of flirt is
to make people feel more positive about themselves, like
you make an auntie or even uncle feel more attractive or macho by
flirting with them this way, without any sexual
innuendoes.
If you're in a relationship and are just waiting for the
inevitable to come, then I would say you're not a man. If you're a
man, you shouldn't be waiting and then use this as an excuse to
"flirt". I am very sure your context of flirt consists of more than
what I've described above. If you're a man, either
you bring this relationship to a close, get it over and done with,
then move on as a single bravely and magnanimously to date around
freely without guilt, or you try your best to
salvage your own relationship wholeheartedly. Trying to test market
by seeing if you can hook up other girls while waiting to see if
your current relationship problem will resolve by itself is
COWARDLY and STUPID. It is like an ostrich sticking its head
beneath the sand when danger approaches and hope that the danger
will just disappear "magically" by itself. It won't. Not only that,
you are already ruining any chance your old relationship will
revive or that the new girls will fall for you, because your time,
energy and attention have been divided and women can sense this
even if unconsciously. In the end, even if you are starting in the
new relationship you have just secured, it will also start on
another shaky ground (because foundation at the very start had not
been strong enough due to your habit of avoidance of issues on your
part) for problems to fester in future.
In the end, it will not be a win-win situation. In fact, it will
not even be a win-lose situation in your favour because a
relationship requires both parties to participate and any unbalance
on either side causes a relationship to go sour. Intimacy doesn't
work this way. It will be a lose-lose situation
eventually and will not do you any good even if you have all the
"options" you wanted.