Your reply to that post is more than curious to say the least...
In the quoted post, he didnt say anything about him being on man-whore route, yet going for multiple playthroughs...So not sure why are you pulling that sarcastic card-reply then?
If your mc is not-so-nice and he fucks (or tries to fuck) any girls that appears, there certainly are other way for playing this.
For example, my mc has zero interest in Lori, her friend, yoga teacher, Natasha....Since he met Julia she is the only girl for him...and Cass ofc, yet that also fits into "mr nice guy" for obvious reasons