What do I do?

My partner has a history from the beginning of our relationship of cheating and lying even when questioned. I stayed with them since this had happened when alcohol was involved and we were young, I forgave it and was mostly hurt by the lying that occurred.

Recently, my partner sent pics to me, they were lives… the audio in them was quite suspicious. When I asked they acted shocked at me for even asking and told me another friend was in the room. However, I saved the lives as videos and it extended the audio. The gender of the “friend” definitely doesn’t match up with a voice that can be heard in the background of one of the extended lives it’s clearly not that person at all.

Along with this other sketchy behaviour has occurred like staying late at work and their location services magically doesn’t work for a bit. Again these behaviours aren’t too weird but with the added lie about who was in the background of the video it’s starting to look not too great.