Regardless of outcomes, your faithfulness is still virtuous. Living completely in inner truth is what you want to aim for. Sometimes that means persevering in truth over a period of time. When it doesn't work out, you have trained yourself to be faithful. The most important thing is probaly that whatever you are doing is truth for you, but without dependency on the other. There is no dependency when reciprocation is not necessary in order for you to feel loved by the simple act of doing what is true for you. I've met a person with an imaginary relationship and it keeps him focused on his creative output. It's very important to be able to maximise creative output (perhaps through your muse?) and to not overrationalise. That is because we live in the age of DALLE and artificial imagination, and you need all the entropy you can get!