Is dating someone or having long phone convos worse?

Mia
My ex and I broke up about a month ago but we still talk about working things out and not seeing anybody else. Once I started to lose hope for our relationship I went on a date my ex found out and and devastated. However he started talking to somebody some girl on the phone and having hour long conversations..
In my opinion I think that's worse because you're forming some type of relationship although he claims he's never hung out with her. For me it was just one time date just to make me feel a little better.
What is your opinion, is it worse having these phone conversations or going on one date?
P. S. He also broke up with me this was not a break this was a complete break up