Not sure what to think of this situation with my ex, what could his motives be? does he want me back and is he messing around?

So my ex boyfriend and I broke up a couple months ago (his idea Due to his busy schedule and emotional instability) but we’ve remained in contact ever since. When he ended things he said that we could try in a year when he’s finished school and has less on his plate. Obviously I’m not planning to just strictly wait around for him, I’ve put myself back out there on dating apps etc. just including that piece of information for context.

We speak daily, and he’s gone as far as checking in on me when I haven’t been active on social media as well as checking my location and asking if I have any random DM’s. He also regularly asks if I’m seeing anyone.

The last couple of weeks we haven’t spoken as much and I can tell he is depressed.

But we hung out recently and spent the day together, going places and doing things we used to do, and then we ended up hooking up. After we hooked up he got quiet and when I asked him what was wrong he said we “shouldn’t be doing that” (in regards to having sex). I asked him why, and he said it was because “you’re a girl and I’m a guy and we see things differently”. I found that offensive and told him I was under no delusions about the state of our relationship or lack thereof. We continued on after that as normal, but it left a bad taste in my mouth.
I really don’t believe he’s the type of guy to just simply use me, but I can’t figure out his motives or what he wants/expects from me right now.
Any advice or opinions are appreciated but please be respectful

Not sure what to think of this situation with my ex, what could his motives be? does he want me back and is he messing around?
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