I'm going to have an affair with a man engaged to someone far away
Why would you pursue a relationship with someone already engaged? Do you want to have kids with him?
Probably, but I don't think he wants to have more kids.
You should not have an affair because it's wrong. You could break up their relationship.
It will feel amazing to have him again.
I want to reiterate: it's very wrong to have an affair and there's a lot of single people who you can have a relationship with and I do not think that it is healthy for you to just actively seek this person who you are very aware that is already engaged. I would strongly suggest that you block all communications from tis person and just find someone online or on a dating app.