<human>: My SO (26 M) and I (24 F) have been in a relationship for 3 years. Recently, I have become uncomfortable/jealous of his new work partner (25 year old single female - Betty). They worked together for two months for 50+ hours/week. The nature of the job mostly involves two people working in close partnership, in some high stress situations and occasionally working with other groups. 

Over the course of their partnership they developed a friendship and I had become jealous of their relationship. I wanted to meet her because I thought it would relieve the jealousy. When I met her she seemed nice enough but during the course of the catch up she seemed a little too friendly with my SO. For example: she recalled a funny anecdotes about times when he teased her about something or a time when he got cranky in a certain situation and how they laughed about it together afterwards or a time when they shared milkshakes in the park. I felt like the third wheel in my own relationship.

When their work partnership ended SO received a text from Betty asking how he was going with the "break up" and he responded that he was "coping". There were a few texts like this exchanged. When I found out about these messages I felt like I had been completely betrayed because using the words "break up" to discuss the ending of a work partnership seems a little too intimate for my liking.

I don't know if anything romantic is going on or if my SO genuinely just wants a good friend with this person. But their relationship makes me feel uncomfortable.

Did I overact in feeling betrayed by their text exchange? Do you think Betty has a more-than-friends feeling for my SO? If so, what can I do to feel better about the situation? What do you think SO gets out of his relationship with her? Guys of reddit, have you been able to have a completely platonic relationship with a female without any feelings of desire or needing validation?

Could you distill the essence of the text into 1-3 sentences?
<bot>: SO and work partner relationship too close for comfort. They discussed their "break up" via text when they stopped working together. Is this too intimate?