Well that's a rather awful situation.

I'll just say a few things, I apologize if I'm rather direct and blunt.

Someone that cheats doesn't really love you in any meaningful way, that's just the way it is. They can make all the excuses possible, cheating is cheating.

Someone that cheats isn't an honest, decent or trustworthy person in general. So what is it that you really love about her? by your comments it just sounds like you attached to the first person that would let you. Sorry to say that's not love either, at least in my opinion, that's emotional dependency.

It seems a bit obvious by your comments that you're not in a good place in life and that you probably feel that this woman, deceitful and toxic as she likely is, is better than nothing or being alone. Which is clearly not a healthy mindset, I'd even dare to speculate she's outright taking advantage of you as she may know you're emotionally dependent on her and your response to this has only proved that.

Sorry to be blunt but I don't think she loves you one bit but the bigger problem is that you also don't love yourself. And until you start doing that then you're unlikely to become the type of person and make the type of choices that will lead you to find someone that actually loves you, not someone that exploits you for their own benefit.