Do your best and worry less.

There is one thing I have learnt: 

If a person wants to spend time with you, they will spend time with you. 

If a person wants to write to you, they will write to you.

If a person doesn't want to do anything, you will know it too.

There is nothing really you need to do except to go about your own business and being the best in what you can in serving others in need.