Taking a look at insecurity can involve looking at what needs are unaddressed in your relationship. It also involves looking at life, as a whole, to see if there are patterns of feelings that stem from feelings in childhood.
Are the female friends a threat, in that it's flirtatious, or a threat in they receive a level of support that maybe you feel, lacking? Do these friendships tie up a lot of time, that you could be bonding and building a solid relationship?