Since the problem arises mostly when you're all three spending time together, is it possible for you to schedule more one-on-one time with your partners? I also think that if you need support, you should communicate that. There is really no way for them to know that unless you tell them. And no matter how long term their relationship may be in comparison to yours with them, as long as you're all in it you have the right to express your needs and can reasonably expect your partners to be willing to meet them.
Also, as in starting any kind of relationship, you shouldn't neglect your friends because of that! Obviously you may have some less time for friends, but if you feel you have less close friends you used to, you have some apologising to do.
Last edited by rory; 10-06-2011 at 04:26 AM.