Boyfriend texting other woman,am I over reacting?

[onefootinthegraveyard]

So I did something stupid.
I looked at my boyfriends phone when he stayed over and was asleep.
Anyway there's lots of messages on there to his friend (who is female and who he has history with )but they are just friends now.
He was at the gym on Wednesday night and he is messaging her
It goes like this
"It's too hot to be at the gym,with a pic of him on a machine"
Then he says this machine is hurting my special area (his bits )
Now scrolling back they text every day.
I didn't have time to read back everything but at the weekend he was texting her saying he was just getting off night shift and needed looking after and just general chat really but it went on hours.
Should I be worried here?
Obviously I can't say anything as he will know I'm looking.

The nature of his conversation is come & get me to her. I think he’s being spineless to you, as he’s clearly not happy with you.

You’re worth more than this

There's no need at all OP.

If they've already slept together and the flirtings continued then that's not a friendship. It kind of seems like options are being kept open/back burner kind of thing.

It's not appropriate if either is in a relationship.