Relationships at your age and in your circumstances can be volatile. My advice would be to transfer if: a. you would be happier at the school you are transferring to without your BF in the picture and b. you would be able to afford this school without the BF in the picture.
These are difficult hypothetical questions to answer but when reading between the lines of your post I think that your main reason to transfer is the BF and if all works out with him it will be great, but make sure that it is right move for you personally. Would he be willing to transfer to your university to be together? Hypothetically speaking?