It's not your fault. You have tried to make it work. You must always remember, the best thing to come from it, is Bio.
In life, many things are out of our control. Love is something that is true. When two people don't feel the same, it can make marriage very hard. If bio saw you and he upset all the time, that would upset him.
Sometimes, the best decisions we make, can also be the most upsetting. But we must believe that we do our best