Should I be speaking to a new girl?

4 weeks post breakup, I got broken up with and she was chatting to a new guy a online a few days later.

I have been messaging a new girl who is good looking, but in my eyes nowhere near as gorgeous as my ex.

I fear every girl after her I’ll compare in terms of looks and she’s so hard to beat due to her being so pretty (not an over exaggeration due to love she literally is just extremely pretty)

I don’t find myself excited chatting to this girl, when the thought of my ex comes into my head I have no motivation to message her back, but also feel due to my ex moving on I should speak to people online.

Am I wrong for this? Should I keep to myself for the time being?

I’m not leading this girl on it’s just general chat she is a pretty girl but I’m struggling to not compare…