Is he having an (Emotional) affair? Thoughts please🙏🏻

I think my husband is having an affair with his colleague at work. I am a bit confused as she is a lesbian. Im not sure if anything sexual has happened but have found messages from him to her saying he loves her, hes been thinking of her, shes amazing, i cant wait to see you and when hes been on leave from work messages saying absence does make the heart frow fonder and ive been thinking about you in a positive way. This is far worse to me and id rather it be just sex. What do you thi k? Am i over reacting? Is it just a friendship or am i right that these messages are inappropriate? I can post some of the actual messages if that helps?

I plan to confront him but am just gathering more evidence and have an appointment with estate agents and a divorce lawyer this Friday. I want to know what my rights are before i set the bomb off!

Would really value comments. I have no one else to talk to about this. I feel ashamed to me tion it to anyone in case im wrong.