Double thinking.
This is exactly what happens when your have accepted two
contradicting statements and compromising it.
He wants to exterminate any possible guys from having any form of
social contacts with you, at the same time, refuse you when you
demanded the same for him. Such common advantageous plan man often
put into implementation, which is born out of a mixture of male
chauvinist, mistrust, flirt-proof and controlled security in the
relationship. When that happens, you are forced into compromising
emotionally because it seemed reasonable on his side to deal with a
gal friend's problem, yet having to coax yourself into believing
that trust is the main essential ingredient here and you ought to
have it. However, when the table is turned around, you are expected
to drop whatsoever immediately, for your doing endangered the trust
of the relationship.
Double thinking - you are forced into two sets of
thinking when placed into either-side of the scenario.
He was a flirt; when he lingered with the ladies, it activated your
insecurity. This
insecurity came with the birth relationship - you
recognise and knew it long ago. Entering into this relationship is
accepting the insecurity as part of the package. Of course, a big
effort of yours is to avoid triggering this insecurity during the
course of the relationship because you are seeking for a long term
fulfilling relationship.
Believe you me, you will never stop triggering your own insecurity
as long as:
I) You refuse to acknowledge your present and future of your man
& relationship AND chose to believe the previous him. Whether
he has change or not doesn't matter. Remember, you chose the man you wanted
for a boyfriend, if he is a jerk; you still made
that decision to be with him. IF he is a jerk and he plays with
your love - who's to blame ultimately? You isn't it? You allowed him to be with
you.
Place effort on something you could work around
with (the future of your relationship) and not
dwell in his unchangeable past.
II) As long as this advantageous plan of his is in effect, you
should not find security. It forces you into double thinking (if
you wished to continue the relationship) and trigger insecurity
that came with the relationship.
P.S: You may probably need to communicate about this. If trust is
the issue here, fine - both of you are eligible to mingle with
friends from the opposite gender (provided it is as simple as
friends). If it's about the insecurity part of you, fine. Work out
a viable solution where both of you could accept and still lead the
relationship comfortably. (E.g. He could do wth he wants, but
negligence to you is NONO). If it's about both issue, fine. Speak
them out tactfully and see where it lands. 
Cheers
