My Exgf jerked me off as I watched a video of her with another man[cuckolds perspective ]

So my Ex and I have always been pretty close, but over the past 6 months I genuinely thought things were over between the both of us.

She’s been seeing another guy , even went on holiday with him and told me she might be living together with him.
Obviously I was upset, but it was for the best and it’s what she wanted. So for the 6 months I’ve tried to move on, I’ve been on dates, slept with other girls. But I always end up looking at her pics and jerking my cock to the thought of her using this 7 inch cock like a toy hoping she’ll send a video.

Well, just a few days ago she drops me a text asking to meet up. Incredibly eager to see her again I quickly reply saying “yes, of course”. Long story short, we have a few drinks and end up having sex on the floor in my apartment. My first thought was after 6 months her pussy hasn’t changed at all.
Later that night, we end up in my bed pillow talking, she tells me she made a home made video with him. Instantly I’m nervous but I ask to see this video.
I must admit, I had very mixed emotions. Seeing a girl that I care for so much to actually see her with another man was a shock, but to see her moan and kiss him as she climbed onto his dick filled me with jealousy and instantly my cock was hard again and she already had her lips wrapped around it.
I never felt so nervous watching this video, yet I’ve never came so hard in my life.

I wonder if any of you guys have experienced a similar situation?