Im confused if this guy likes me or not....how do I tell?

There's this guy that I have been seeing for over 2 months now and we recently hooked up about 2 weeks ago. I just asked him if I was the only one he's hooking up with ... He said yes. Then says in a sarcastic way "at the moment" and then laughs and tickles me? then goes "dont worry ill let you know when I find that special someone" and laughs and tickles me again? He cooked me dinner , took me out to dinner, introduced me to his friends, and calls/texts numerous times a day, him being the first one to get in touch me. I'm assuming he likes me since we talk way more than we hook up, and he always initiates it...so why did he make that comment? he's a very sarcastic guy and he knows I'm extremely gullible which could very well be the case that he was totally kidding. but I'm not sure...should I say something ? I don't want to scare him away at the same time..I need advice! Thanks
Updates:
- Hmm...well, I wouldn't want you to scare him away either, BUT I also would not want you to get your heart broken as well.. I would mention it when you are with him..Just something brief.
I would be like, 'You were just kidding the other day..right?'
I am pretty sure he was just kidding..But, you can never be too sure until you ask. I would ask. But, like I said, be brief about it and be calm.
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