Is this a rebound relationship or something similar?

Me and my ex were together for 4 years and recently broke off (he broke up with me) and was mainly because of connection dropping from arguing and stress on both ends. It's been 3 weeks and during that time we've spoken a little and seen eachother and he said how he still loves me and I can still feel the connection and bond between us when we see eachother. He mentioned how he was talking to a girl his friend was talking to (male ego I guess) the last night we seen eachother in person but said it wasn't nothing serious. Recently I saw them on live and he was smoking weed and she seemed like the total opposite of me completley, seemed rushed honestly. I'm not really worried about it because I still feel like we'll get back together soon, especially after I stop speaking to him and go into no contact and focus on myself, I was just wondering does this seem like a rebound to you?
Is this a rebound relationship or something similar?
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