Was getting a tattoo and my boyfriend saw a girl he used to sleep with, went to the “bathroom” and came out an hugged her?

Was getting my chest done and my boyfriend said he had to use the bathroom, left for a few minutes and when I looked back up he was hugging a girl he’s had intercourse with beforehand who he hasn’t seen in a while i’m guessing? the people i was with all looked at me for my reaction, including the tattoo artist saying he hugged her for a long time and was talking about her nails and tattoo. what do i do? this guy lives with me and he wants me to give him the benefit of the doubt but, i don’t know if i’m overreacting or if my intuition is in the right place.

Was getting a tattoo and my boyfriend saw a girl he used to sleep with, went to the “bathroom” and came out an hugged her?
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