My husband(27m) cheated on me(27f) with a girl he met online(20f) and she wouldn’t stop contacting him. Any suggestions how to go about this?

To start with, I am currently 8 months pregnant. I know, stress isn't good for the baby but it was all so sudden. Basically my partner just confessed about cheating on me just a few days ago. This cheating started about 3-5months ago (will elaborate on this later) Bottom line is, I had a feeling he was doing something bad behind my back but I was hoping it was just sexting and was planning to confront him after I give birth which is on this coming May. He beat me to it and I never expected that it was so severe because he went all the way. (One reason for this is because he knew that my father cheated on my mom and I ended up having a step brother. It was a traumatic experience) Anyways, he couldn't take the guilt anymore and had confessed to me what he did. He's very remorseful and ashamed of what he did and wanted to work it out with me. After some thought I agreed and decided to give us another go. (For the baby as well) I have a problem with the other woman though, she wouldn't stop contacting my partner and I want to know if I should reach out instead and tell to stop so we can fix our marriage?

For some context, last October 2023 we found out we were expecting. We were thrilled because we've been trying for 6 months prior (We were close to visiting a fertility clinic) Then, fast forward to today my partner confessed to cheating on me and it started last November. That time he started chatting other women on-line then one of those girls took an interest in him and started seeing him (they went on dates, nothing physical) then a month later that girl found out about me and the baby so they broke it off. My partner thought that was that and stopped the chatting all together and focused on me and the baby (while keeping all of this a secret from me btw)

A few days after that though, (still in December) the girl chatted him back and just wanted to be friends. Idk what kind f'ed up friendships she has because this led to them dating and going all out (it became physical) To put more context into this the other party is (20F) a working student and she had been eager to leave her home and wanted to rent an apartment of her own. The thing is, my partner has a nice stable job. I do to, but despite him earning more money than I do we still split the bills 50/50. So my partner is left with a lot of extra money. The girl had asked to look for an apartment for the two of them with him. I guess this is when my husband got scared into telling me.

The day he confessed, I first told my family (I honestly felt bad about telling my mom cause I saw in her eyes that she sort of relived the time my dad cheated on her) afterwards I told my husband's family. His family are lovely people, they love me and does not tolerate what he did which is I'm ever so thankful for. We (Me, my partner, his family and my family) all talked about it and both parties agreed to give it another go. (I wasn't forced in case you're wondering) My partner, cut all ties with the girl. Gave me complete access to his phone and bank account (his idea btw) and all has been good since then.

Earlier today, my husband told me that the girl still calls him. She was already blocked but he'd get notifications that a phone call was blocked and it was her number. She called him 4 times yesterday and 3 times today.

I'm just pissed off at this point and want to tell her to f off but idk if it's a good idea. Any suggestions how to go about this? Thank you 🥹

Note: -No, the girl isn't pregnant. -And yes I made my partner take tests and it was all negative.