Is it possible that my boyfriend may have actually fallen for the other woman he cheated on me with?

I stayed after finding out my boyfriend was messing around with some chick he works with. I saw messages between them and he swore to me things would stop etc etc. Weeks have gone by and he and this girl have done everything under the sun and it’s more than sex. He hasn’t stopped dealing with her. They have had sex but they have also been on outings, dates, confessed their love and deep liking for one another and they’re planning more dates. He has even had this woman in his bed that we share together. He pays the bills, it’s his home but I’m his girlfriend so I’m there very often so I consider it our home and so does he. I mean, my paintings are hung up on the bedroom walls and I’m sure she saw them. It hurts to know my boyfriend has gone this far with her. He’s risking what we have to do these things with her. We have a strong mental connection and I guess you can say we have a soul tie. We have been together for a while and I never thought he would betray me. The woman hasn’t been messy. She hasn’t been leaving evidence of her being in our home or messaging me, finding my social media etc or things like that but I know she knows about me.

Is it possible that my boyfriend may have actually fallen for the other woman he cheated on me with?
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