Why is he doing this?

My boyfriend and I of 6 months broke up the other day over something stupid. He said he needed space and that we should hang out on Saturday. I gave him his space and ignored most of his calls and texts saying he misses me but still needs space. He told me he wasn’t going to see anyone while we are distancing, but then my friend calls me last night and said she saw him on tinder. I’m completely done with his a$$ but genuinely want to know why he thinks taking a break and hook up with other people is okay... I haven’t called him out because I’m not wasting my time. But Is he hooking up with other people because he is trying to move on? Or make him realize that a girlfriend is not what he wants? I’m just angry and confused.
Why is he doing this?
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