Wife cheated more than once

I really need some advise. This is an infidelity case as well as a drug addiction case so I don't know where to post it. I've got a problem with the infidelity more than with the addiction so I decided this is probably where I should post. This is a long story, but I'll try to keep it as short as I can. My wife and I have been together for 15 years and married for 8. We have a beautiful 5 year old son. We spoke about three years ago about our marriage and she said that she wasn't happy. I wasn't the model husband and she did everything for me and I mean litterally everything. After our discussion I still did not change much and kept on doing what I was doing. A few months later she started using drugs (I didn't know at the time). She started cheating on me with her business partner and then later with an old school boyfriend and last year with a family friend. She actually had a love relationship not just cheating with her business partner for the past 2 years while using drugs. She has tried to leave as she just gave the business to him and we moved further away. This didn't help and she lied even more just to get and see him. Needless to say that we weren't communicating alot during this time and we both were very unhappy. I found out about the infidelity first and took our son and moved out. Things then got out of control. She was never home and slept over at this guy's place almost every night. I then found out that they were using drugs together. I helped her and admitted her into a rehab centre. While she was there I moved back into our house. She has phoned him while in rehab and he came and visit which I only found out about later. When she got out of rehab I found out that she had an abortion with his child while she was in rehab. I didn't know about this until recently. She came clean about everything when she moved back into the house, but has since been contacting him secretly. She says that she wants to try and work things out between us. She has since shown remorse and I can see that she's actually trying. I am also trying and has never been as good of a husband and father as I am now. I got to realise my flaws and am working damn hard on it. Helping out in the house. Saying I love you. Spending more time together and going out on date nights. I thought things were getting better, but found out that she had another cellphone number which only he knew about and that they are contacting each other on that phone. He keeps on saying that he misses her and loves her, but I cannot see what she sends him back. She promises me that she doesn't want him and want me and that she doesn't reply to those texts. She says that she's got that number so that she can sort things out as he owes her money and she wants to get the money from him. She knew that I would've been upset if she contacted him and that's why she's done it secretly. She says there's nothing between them anymore and that she really doesn't want to loose me. She also said that she needed someone to talk to when it came to the drug addiction and I won't understand as I'm not addicted. She needed someone to talk to that understands and that's why she contacted him as he used with her and understands her. She has said she won't contact him again and has broken the sim card without me having to request it. My question is what do I do? She's still in a halfway house and I only see her on weekends. Everybody says I should give her tough love, but in my situation it won't work. I can't kick her out all together because she's got a fall back and a place to stay. I want this marriage to survive this, but don't know if she's truthful and can't trust anything she says.

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