AITAH for giving up hope to fix my relationship and moving on

Hi! just for a little backstory, me (F18) and this guy (M19) met on hinge both looking for a serious/long term relationship.

Once we matched, we instantly hit it off and added eachother on pretty much every social media, we would facetime everyday for 10hours + for weeks on end until finally meeting.

The day of the first date came and he met me outside of my house and we went for a walk and went for some drinks. All seemed to be going very well and i felt a very strong connection with him. After a while at the bar, he asked if i wanted to go back to his place to watch a tv show that we both were watching on facetime together, i said yes and we went to his house. We watched tv and talked and it was a pretty wholesome night and he was telling me things that made me feel secure and cared for.

The next day he asked if i wanted to come over after work, which i did. I ended up staying the night and the next day until 7-8pm and i was so happy and felt so cared for.

However, i got a call at midnight after i got home and he sounded upset and said he wasn’t ready for a relationship and needed time for himself, but wanted to try again with me in a couple months.

I’m the type of person that feels things very deeply and even though i hadnt known him the longest time, i was still hurt but i understood where he was coming from and just wanted the best for him. He told me he still wanted to stay in contact with me and still wanted to facetime.

After the call he was giving me very slow replies which hurt me, but i knew he probably wasn’t in the best mental space so i gave him a little space. However, i find out that 2 nights after he ended things with me he had slept with another girl and was back on dating apps (for reference he doesn’t know that i know).

This hurt me as if hes not ready for a relationship but told me to wait for him, why is he back on dating apps??

At first i understood his feelings but i feel as though he just said that to keep me in his life if he ever wanted me back which makes me think that everything he said to me throughout them few weeks was all fake.

i’ve decided to no longer respond to any messages from him as i don’t think he is genuine to me. however, he expects me to wait for him and to stay in contact but i feel like the best thing for me is to just move on with my life.

AITAH for going ghost on him and just moving on without any word?? or should i explain to him about my feelings so he doesn’t get hurt