Girlfriend wants me back but I went out with a lot of women during our break and don’t know if I should tell her

3 months ago my (M18) girlfriend (F18) and I decided to go on a relationship break because she said the relationship was getting toxic and she needed time to think.

I thought the break was going to be like a week or two at first. So basically she told me we had to go no contact for an unspecified amount of time to give her time to think.

She said it wasn’t a breakup yet but she will decide wether to breakup or not during our break.

After a few days I asked her if she was ready and she said not yet so I asked her every few weeks and it was always the same answer and I wasn’t patient anymore.

I just stopped asking her if she was ready to break up or continue.

A few weeks ago I started seeing women and have slept with a few of them. I got a message tonight from her saying she wants to get back with me and the break was a mistake.

I guess I’m willing to get back with her or at least try but I know she would freak out if she found out I was sleeping with other women.

Would it be wrong to not tell her?