Found texts on husbands phone with another woman - what should I do?

I found texts on my husbands phone with his college "friend". We ran into her last year and he was looking at her weird. For month's he's been on his phone non-stop. Also, he kept sitting in his car in the garage on his phone? So while he was sleeping, I opened it (don't ask how) and saw a ton of messages with his "friend". From what I can tell they haven't met up but he's trying hard to convince her. He showers her with praise, says he's always been in love with her, that "you are the perfect woman I never believed existed". Talks about how perfect her face is. She writes about wanting to start a family (not with him) - my husband is writing crap about her having a 2.0 of our daughter!!! She says "go talk to your wife" and he wrote "Im not thinking of my wife in that capacity" I am devastated but don't know what to say because of how I found the messages. He is pestering her in the texts to let him take her to lunch. She says "sure I'll hang out with your whole family. Your daughter is so cute" and he just keeps responding "you can have 2.0 of my daughter". I am financially dependent on my husband. He even owns the business I run for us and he has another full-time job making most of our income. So I cannot just leave. I feel devastated. But is this even cheating if he hasn't seen her? Is this just fantasy for him? Went through his DM's and texts - there don't seem to be any other messages. He's pretty locked into this one person.

Found texts on husbands phone with another woman - what should I do?
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