What to do about my cat? ?

Giving the cat to your friend will intensify his anxiety. This is soo common. Cats tend to cling to their pregnant owners. Sounds like the beginnings of behavioral problems.You may want to consider temporarily putting him on prozac or another drug to help him adjust to the change in his life. If allowed to continue for a long time, it can be very difficult to reverse. Please don't get rid of him, he loves you and would be heartbroken if he had to be away from you.