Why is he been confusing?

So, there’s this divorced guy, who was pretty hurt by his ex wife cheating on him and We have been talking for two years and at the start he was I like can’t offer you anything and then he was like that he’s not interested in a relationship and he got a bit pissy and he stopped messaging me. Then six months later he’s messaged again apologising and asking if I’m still up for a drink and that he’s getting fit and he’s been think about me and that he should of asked me out on date a long time ago. then if I reply back to him about going out he backs out.
what should do, it’s getting too confusing.
Why is he been confusing?
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