Thought I was over my ex... until I got into a new relationship

Basically to cut a long story short, I was seeing a girl for about 19 months, she was my first love etc but it didn't work out so we finished. Afterwards surprisingly I felt great, slept with a few random girls I met in clubs, had a couple of casual **** buddy relationships and honestly didn't think about my ex. However, now (four months later) I'm in a relationship with a girl I thought I really liked, but all I've thought about recently is my old relationship and how this one doesn't compare. Prior to getting together things were great, but now I just want my ex back and I'm really confused what I should do. Help?

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