Dani,
You are in a bit of a bad situation, and I realize that you are scared about the future of raising twins alone.
You mentioned leaving things opened for him to decide if he wants to continue a relationship with you...I think that's a great idea. You also said that you were undergoing counseling. Have you asked your counselor about the best way to talk with this man outside of the office setting?
I think it is extrememly manipulative to try and get him into "counseling with no specific outcome in mind"...and "HE doesn't have to know" the secret outcome you desire??? You were poorly advised. This man you care about would resent you for trapping him into this kind of situation!!! I would run from that idea as fast as you can if you desire any kind of future with him.
I would allow him to go with you to counseling only if he agrees, and is aware of the purpose....you trying to get back together. Leave no information out before he agrees to a counseling session, so he may be prepare to make an informed decision. You would also need to get permission from your counselor in order for your partner to attend a session.
A relationship takes two people who are "in love" with each other in order for it to be successful. You certainly don't want to start off by "playing games" or being manipulative with him. I'm not suggesting that you have done so...only hoping you don't make that mistake. Even when two people are in love, hard work is ahead of you...especially facing the birth of twins.
I think you are right in going with your gut instinct of telling him everything up front that you desire...then let him have some time to think it over. Only then can he do some soul searching to decide if he is in love with you, and has the same desires of having a relationship with you. If he is the birth father of your unborn babies, then no matter what he decides to do about being in a relationship with you...he will always be connected to the children. That is another thing you need to let him think about.
You are wanting him to understand hormonal imbalance during pregnancy, right?? Let him read What To Expect When You Are Expecting . There are explanations there that may explain some of the ways in which you have been behaving. There are also good books regarding having twins...remember, there are even more hormones going crazy with multiple births.
I hope everything works out well for you.
Julie