<human>: My boyfriend and I have been together for close to a year now, and our relationship is generally wonderful. We unfortunately have to deal with his ex as she is involved in some of the same activities as us, and she has done some psycho stuff like pouring a drink on him then leaving him voicemails at 4 in the morning sobbing while living with her bf at the time. Recently she's been surprisingly quiet which has been a relief as I do not want to have to deal with such drama. 

Last night we got in a minor fight, and he called me by her name. I grabbed my stuff to leave (we don't live together but spend 5 or so nights a week together), but he started apologizing, crying, and saying it was an accident, and it didn't mean anything. I stayed the night but am still very shaken by it. 

He said that they don't talk, yet he still has her number in his phone. I also just don't get how this is happening now rather than the beginning of our relationship when they had only been broken up for 3-4 months. He also lied once about her being at his place. They had lived together, and she came over to get something she left (which I find funny that she didn't care until suddenly I'm in the picture). He said nothing happened, and he didn't tell me because he didn't want to make a big deal out of it, but it still sketches me out. 

I don't know if this could possibly mean something is up or if I'm just overreacting. In my past long term relationship I was cheated on, so I do have some trust issues and am worried about being over paranoid. Any advice would be lovely!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Boyfriend called me his ex's name. I'm upset and not sure if it is something I should worry about.