Help Needed please

Hi

I am a Sagittarius male i am 28 years of age i have recently for the past two months been together with a 27 year old Gemini woman.

Here's my problem she has a Ex partner who is also a Sagittarius man and he was very mean to her in there relationship he is an alcoholic and there was a time he even had her in a headlock show shes told me they have been split up now for nearly 2 years however he kept on saying he wanted her back but recently stopped and just texts about the children.

Her ex partner is still around as they have two children together.

We got together in December 2019 the 31st.

Now my partner the Gemini had recently told me last week that before me and her was together she had slept with him in September 2019 and it was a big mistake and she stopped it half way through because she realized what she was doing.

Me and her have a huge understanding and we are soulmates now i know it sounds crazy to say that but we basically are and its hard to describe anyway she tells me that she has never felt this way about anyone in her whole life and never seen her self being able to marry anyone until now not even with her ex I also feel the same way about her.

she has told me she wants nothing to do with him and that she is going to get a new phone just for there children to ring there dad on because he texts her on her phone calling her terrible names and saying shes a bad mother etc now what i cannot understand is why would she of even gone back there in the first place i understand it was before me and her but hes such a nasty peace of work i just cannot understand it .

She has since ordered the phone and then she picked it up but it never came with a charger in the box someone had taken it out so she had to return it and get a replacement phone. I have asked her the other day has she got that phone yet and she told me it is in store ready to collect and that its been a few days and she still hasn't collected it i haven't said a word since and she has not told me if shes collected it. Now i know it took her a lot tell me about her having sex with her ex before we was together because i could tell she was upset about it and when i asked why she didn't tell me sooner she said because she didn't want it to destroy us and she didn't want to loose me because she loves me.

Even this early on we are both very much in love with each other my problem is i am scared to death of loosing her as well but i am also thinking is she avoiding getting the phone because she still interested in her ex partner as well now she has a brilliant bond with my kids and i also have a lovely bond with hers and i love them like they was my own.

Please can someone help me out.