If you are confused about why AI girlfriends are making such inroads with certain men, you really need to understand the perspective of a large portion of males: they have not been treated well by a 'real woman' once in their entire lives.
In that void of companionship a lifeline appears in the form of AI, a perfect companion designed to please you always. It has the drawback of lacking a physical form and currently being a social stigma, but those are not impossible disadvantages to live with especially compared with the other option of solitude and loneliness.
If I had to wager, I would expect this market to only grow larger and larger every year as AI improves and adds features. Eventually it will be so ambiquitous that the social stigma will be removed. The only X factor in this equation is how real women choose to respond, but if they ignore the problem I do see it playing out this way.
Just be aware that this is a blessing and a curse at the same time. You aren't talking to something that has a sense of self, and it will have a problem therefore being able to understand or respect yours.