So I have been suspicious of my partner and best friend.

Nothing super serious at first but a couple months ago I started to notice things. At first little things, like laughing at each other jokes a lot, even if it wasn’t funny or a joke. My friend starting to become super comfortable, I honestly don’t usually care but it started to turn from every now again from it being super hot. To saying it hot in the middle of winter and wearing swimmers. At first I didn’t take notice and thought just my imagination and I’m over reacting. But it got worse and he would constantly want her to stay or go pick her up even if she would be able to come down herself, or when I would enter a room things would go dead silent.

I keep thinking it was nothing until, my partner was picking my son up from her house, which I did know about but I didn’t know when he was picking him up and he said he would call to let me know when he has him and they were coming home. This is where things get suspicious I called her to see how things were going, at first everything was fine until my partner turned up. She went really quiet when talking to him, which I did put to my son being asleep near them, but this is where things get weird. All of sudden she says out loud “so so is on the phone” ( blocked my name out but she said it), when she said that he took the phone and sounded nervous, than all of a sudden he said “I have to go”, and gave the phone back to her, which she said “sorry me too”. About half and hour later she calls back. At first I thought nothing but it just didn’t sit right and I confronted them but they said that is was nothing. They explained that it was because my son was asleep and my partner came in really loud? And they were both adamant that nothing was happening and this was talking to them separately too. I believed them but things haven’t changed and just today I walked in to see what was happening in our smoke room, and there they were, together. My partner standing right behind her and reaching for something above her head, right on top of her, when I opened the door he moved he’s hand away super quick and questioned why I was in there. They both left the room quickly, since than I’ve felt so sick. Like I did with the phone situation and he keeps questioning if I’m okay and if I’m mad, she is also playing with my son a lot. Am I crazy or is this suspicious. I know cheater will generally lie but they both have been pretty consistent with them saying that nothing is happening.