This might not be considered cheating but still I need some help

I've found myself living with my ex for the past month. We have been intimate and a lot of times he treats me like if we're still together. I do love him but I keep reminding myself that we're not back together despite the living situation. I really needed somewhere to stay for a lil over a month. We were getting along great and he had no problem with it.

Like for a short time after we broke up we kept things casual and then he warmed up to me. He started to treat me a bit like how he used to when we were together.

A few days ago, I saw a woman call him. It took me a minute before I decided to not hold me tongue and ask him who she is. He said a friend. I acted like a didn't hear him as it was a bit noisy when he said that. I asked him again and the way how he answered felt kind of dodgy and like he was omitting something. He again said a friend and that they tend to eventually not get along due to difference of opinions. And he knows her through his cousin. What stood out to me was the time she called him; after 9pm. I wasn't supposed to be there that night.

I left the next day and told myself to be mindful about where things are. I know it was just for one night I wouldn't be there but I still decided to be a little more observant. There were some differences, very subtle. But my actual stuff was right where I left it. Well, except one thing. The subtle differences still stood out to me. The first night, I had brushed it off in case I was overthinking it. We were intimate that night.

The next evening, it was a bit out of mind. But not too long after he reached home, she called again. He silenced the call and was like, "she just want to pull some smalls and he not bout that right now" After, the call rang out, she sent a message asking if he was asleep. I decided not to question it cause I wanted to be intimate with him that night as well.

This morning is when I decided that I'll confront him about it after work. I'm really looking for some advice on how to approach this considering we never actually got back together (in the official sense. Although, I would like to add, that his friends refer to me as his "gyal". He does refer to me as just a friend when he introduces me to people. So it does confuse me as to why they refer to me as such.)