Hi Girls!! I need your help urgently!

Bit of a back story : my partner has a history of cheating and talking to other girls sexually. However, for the last twelve months I don’t think he has been doing it, I have felt that he has changed.

He has been very open and honest lately about everything and it’s really given me a good sense of security.

The other day he left his phone unlocked on Friday ( I don’t know the password ) and I had a very brief look at it and saw he had been messaging a girl he met when he stayed at her Air bnb. He told me about her at the time, he stayed there a week, they went swimming together and he said they got on great. I didn’t get jealous or say anything as I’m trying to move into a space of displaying trust.

Anyways- the message I saw from this girl was very brief , nothing sexual or anything but it was a reply from him asking how she was and then I assume the conversation would have continued.

Today I randomly asked if he has been talking to any girls( I ask every couple of weeks as a check in anyway) and he said no. And swore on my life and said I was carrying on and told me to go away.

I understand he may not want to tell me because he doesn’t want to hear me question him. And my friends have said “there’s always little things partners keep from each other” which I understand.

Do I go on with this? Or drop it? Am I overthinking it because of the past and it’s probably innocent but he doesn’t want to tell me. Or should he just be honest even if I was to question it I have good reason?

I’m so unsure any advice would be appreciated 💖💖💖💖