Based on the pics given, it doesn't look like there is much to the game except very quick and merciless NTR. I like NTR as a possibility, based on bad decisions. This one looks a bit too much like it is all the game has. And having a spine, and ejecting people (like a horny roommate who is trying to steal your girlfriend) because they are bad for you is not douchy. It is being a man.
That said, maybe a relook at the overall situation, a quick rewrite that allows getting with the ex, just might salvage what looks like a problematic start.