How would you feel if your boyfriend did this?

[EncantoBruno]

Back story:

Boyfriend starts job at new company and makes friends with a female colleague. They become very close and do a lot together. She is in a long term relationship as is he.
Boyfriend leaves company and moves a few miles away to a different town.
Boyfriend currently self employed (flexible hours).
Boyfriend stays in touch with colleague and drives 45 minutes every day to see her on her break.

Current situation:

Boyfriend and girlfriend just had a baby so both on maternity leave. Boyfriend still meeting colleague daily.

None of these people are me.

What would you think of this situation?

Thank you all for your replies.
He is definitely meeting the suspected colleague as I work with her and she often mentions him when she returns. Everyone at our company know they meet daily on her break. A few people have raised eyebrows at this due to the circumstances.

The girlfriend is my best friend. She has been upset about it and I have told her I wouldn't be happy at all.

I might show her this thread.

It’s very strange especially now that they’ve had a baby and he hasn’t limited the amount of time he sees her…. I personally think once a week would be a bit much let alone daily. Not sure what sort of relationship they have going on but it sounds massively inappropriate. I’m guessing your best friend has tried to speak to him about it and he acts as if she’s in the wrong for speaking about it?

Meeting once a week is a friendship. Meeting every single day when you have a girlfriend and new baby is quite frankly very odd

He wouldn't be my boyfriend anymore.
DP has female friends he's known since school and university. He sees them maybe every few months, sometimes with partners, sometimes not.

It’s easy to say from the outside you wouldn’t stand for it but what hold has he got over her? Is he gaslighting her into believing she is unreasonable to be unhappy about it? Or is he threatening to leave her if she doesn’t put up with it?

They are shagging. He’s cheating in plain sight.

I've been the woman with a baby and my partner spending time with a female colleague of his.
In my scenario the colleague was going through an acrimonious divorce and had a child who was frequently ill and my partner was providing emotional support just as a friend.
They weren't having an affair, but it did take him emotionally further from me and he decided he didn't love me any more and wanted to leave.
She dropped him like a hot potato as didn't want to be involved in breaking up someone's relationship.

Having a platonic friendship is one thing. Spending all that time away from your actual partner especially when there's a new baby in the mix is not a good thing.

They may be just friends, but I guess without further proof, then it's uncertainty