Is this ohk in a relationship?

My girlfriend talks to her ex regularly and I have spoken to her telling her I'm not ohk with it. She says she understands and won't do it.

Thereafter 2 months later chats to him again regularly...

I oneday found out because I saw a message from him while she was texting where he said

"Love you❤️" and she replied "Love you too"

When I confronted her she said they're just good friends and didn't mean it like that... she will Always care about him.

What do I do? This is bad right?
Is this ohk in a relationship?
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