He betrays his successive girlfriends without hesitation and without suffering the consequences. He is very lucky!
I wouldn't say that. He's only lucky so far in the sense those aren't his girlfriends yet and that all or most of them are giving him a pass for the time being. Let me explain what I'm referring to.
Sage views the MC as a fuck buddy and therefore doesn't care if he's with other women. As far as she's concerned she's still taken by Chad and says as much herself in Episode 4 if you stay in the HOTs house. She has to come to the realization that things are over with her and Chad and choose the MC for anything more to become of them, but mentally she's not there just yet.
Bella is married, and also endlessly points this out. Again not his girlfriend and doesn't really care that he's with other women, even pushing him off to her best friend Jill (if she approves of him). For Bella he's just an outlet for pent up sexual desire/frustration until she makes up her mind to move on from her 3 year absentee husband.
Josy/Maya have each other, and depending on how you're playing the game the MC becomes a new inclusion to that relationship at the end of episode 4. So it's hard to make a call on how things will play out when it comes to him sleeping around on them until we get future episodes, but I suspect it would be much like the other girls.
The side girls are all party girls who aren't looking to be tied down currently; with the exception of Jade and Cathy being teachers and one being married. Both of them are similar to Bella in the sense that they are just looking for sexual release and to feel desired by a young man.
And finally there's Jill. Who of all the girls tells you flat out how she feels about him messing around with other women right at the beginning of their date in episode 4. She doesn't see him as her boyfriend yet and expects that someone attractive such as himself would be dating around. But she also states if he were in an actual relationship she finds it despicable. It's an obvious hint that when things do get serious with her and you're still screwing around with other women this relationship will go badly for you.
Overall most of the women (more specifically the main girls) aren't at the point where they see the MC as their boyfriend so they aren't upset yet. Aside from Josy who he's known for several months he's only known most of these women for a week or 2 at best. If Sage was your girlfriend you can tell by how she reacts to Chad's cheating that she'd react the same way if she genuinely felt the MC was her man. All of this will change eventually and it's hinted at in the game by several women. Messing around with multiple girls is fine for now but it won't go on forever unless you just want your MC to end up alone or with a like minded girl. I'm not saying what he's doing is ok but that's why there hasn't been much if any backlash at all for being with multiple women.