5 months of dating, what should I expect from this guy?

So I’ve been seeing a guy for about 5 months.

The first 3 months were good as we just do things as casual because we don’t look for a relationship. we just need someone to hang out, to have some fun when we have free time. We still kept seeing other ppl, and even slept with other ppl for the first 2 months. I didn’t expect anything from this casual thing.
2 months ago, we both joined a festival in 3 days. He was with his friends (his ex gf was there too – they broke up 1 year ago after a 3 years of relationship. But he never told me that she’s his ex gf but she’s a good friend), I was with my friends.I asked him to give me a lift there but he told me that he can’t because he’s going with some friends. So I sorted it out by myself
I bumped into him for the first night he came to say Hi and ask me if I wanna smoke a joint with him, I just said Hi back and got back to my friends. He was with his friends and ex gf. We bumped into each other on the next day then we were together most of the time. He got back 1 day after me, texted me If I got home safe at that night. then want to meet me when he got back. We had a talk, and he said … we acted like a couple, it’s dangerous. He wants to keep it casual.He doesn’t want me to think he’s ******* or w/e like that after. I was cool. And replied that : I think everything we did was casual. we both had fun, that’s what I was looking for. And we talked a lot. A real talk after 4 months together… We just started getting to know each other better from that day.

After that, I still play cool. Because of what he said, I still keep seeing 2 other guys. But he doesn’t.. He cares more about me, texts me more, spends more time with me and pays attention on things that I said and so on. He’s slightly changing that may be he even doesn’t know.
The other day he asked me if I remember that i told him I don’t want him to sleep with other girls and asked me if I sleep with anyone else, I said No. I might still see other guys but I don’t sleep with them. And he said he doesn’t do it either, he even doesn’t sleep with any other girl because he has the best sex with me all the time. And we agreed that we are sexually exclusive.
He said he likes me but he’s not ready for a relationship because he has a lot of things to do and a relationship may distract him, but he wants to do things to make me happy, he doesn’t want to do things that makes me feel bad. He wants me to feel happy, joyful.

I feel it very clear or may be it’s just illusion that from then, he’s getting more into me. For now, we meet a few times a week, he’s busy but whenever he has time he always wants to meet me (sometime just for a quick brunch, coffee, lunch). He texted me when he’s sick. He took me out with his friends (also his ex gf was there, they are all still hanging out in the same group and gonna open a new bar so it’s the reason why he’s busy). We danced, we kissed in public when his friends’re around. He asked me to go camping with him and he had everything prepared for me. He makes me breakfast, cooks me dinner, let me get into his place without him staying home, shares more about things he’s doing, takes me out on dates, holds my hands when we’re walking in the street and anything I asked for. To be honest he treats me like a queen. When I plan my holiday, he said he wants me to spend sometimes with him in my long holiday. We also plan to buy couple phones and even bought couple pyjama.

When my period came early today, I was at his place, and have no tampons. I went to the bathroom then asked him which date is today. Then I said it was early. It took him a while to get it, and he told me to get comfortable and show him the photos or the brand name so he can know what to buy. Then he left and got back which exactly what I want.

Also he’s very busy atm and I work full-time so our timetable sometimes doesn’t fit well, but he always tries to comfort me by telling me : “I’m very busy now, I can’t spend a lot of time with you for now but we will meet and do things whenever I have time.” and he really does it.

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Now my friends tell me it’s getting serious.
He acts seriously and still says that it’s casual. I’m cool with the casual thing but I also wonder if it’s getting really serious? And what should I do next, trying to get it back to casual level or carry on with serious vibes? Should I expect something like a relationship from him?