Need help looking for a oneshot

The plot was about two fwbs the girl is into the guy but can't handle his lifestyle of doing it with other girls

The guy meanwhile completely stopped doing it with other girls the second they started and planned on proposing to her when her birthday comes only for her to ask to end there relationship

The next day results in him kidnapping her tying her up and trying to get her pregnant or admit she still loves him and that she believes he loves her too