Not staying a monk, is indeed sinful in the one who has already become a monk, but not in the one who did not become a monk.
I am a Roman Catholic, and in the Latin Canons becoming a monk is counted after making a vow known as "eternal". I have not. In your Canons, becoming a monk is counted from being clothed in a schema. I have not.
This is no lie, and if anyone tells you otherwise so that you worry about my salvation if you see me marry, that person is a liar.
I am not responsible for lies that have been told behind my back, even if they are flattering. I have no duty to pay for them by one kind of life, if another kind of life suits me and my duties as a Christian better.