Giving up

We have been trying for over 7 years! We split up for a bit and in that time he got another woman pregnant! With twins! Which she had terminated! At 12weeks :# we tried everything just to have another baby. We have been at a fertility clinic had every test going and all come back normal! There answer to us is there is no reasonable explanation for not being able to conceive so they can no longer help. They did however say we have about a 3% chance of ever having another child. I'm worn out and sooo emotional! I just can't do it anymore! All my friends and family have 3-4 kids without even trying! And best of all they don't even want the child but go through with the pregnancy because they don't have the heart to terminate!