Re: living together
You are doing it to yourself. A normal person with normal emotions and feeling will be devastated and will be asking how to stop this wedding and how to win him over , but you are letting him go willingly, instead of asking is it fine to be a keep .
He is marrying someone and you are saying he has been loyal to you and you are OK with his decision. It is not normal behavior at all unless you consider you are a monk and care for happiness of others and believe in just giving but I see that you are not living in a monastery so you are not a monk.