That’s some seriously scummy thing to do. Playing with his feelings? This is what destroys men and women, and I’m dealing with this now because a scumbag bastard did this to his ex, and now she finds it so hard to trust. End your engagement before it goes further if you have even a shred of guilt, which I hope you do otherwise you wouldn’t be here. It’s seriously sick, if he finds out it’s gonna break him. Don’t do it.