Is my boyfriend cheating on me

My (24f) boyfriend (30m) and I have been together for 2 years. I’ve recently found out that my boyfriend has been using drugs (meth). This has caused me to become very worried that he’s cheating on me. I have caught him having sex with a female coworker, and I have caught him smoking meth with a female coworker. I have told him this is unacceptable. I have also told him that I do not like the female he was having sex with and I do not want him to have anything to do with her. He has told me that he would never cheat on me and that he has been faithful to me for 2 years. Is this true or is it not? <br><br>**UPDATE**: I’m getting ready to post an update when I found out I had a text from a number I don’t know. I go to check and it’s him and his girlfriend. They have been cheating on me for a year. I am leaving him. He has 3 other women he is having sex with. I am done with him.