I (23) female moved in with my ex‘s boyfriend best friend

Me and my ex-boyfriend We’re going to call him (Alex) (male 24) have been dating for two years and living together. We broke up and he kicked me out. I had nowhere to go, and I was talking to his best friend we’re going to call him. (Ryan) (male 23) about everything and his best friend Ryan offered me a place to stay. I moved in and after a while we have gotten really comfortable. Alex is not comfortable with me living here even though he told Ryan it was okay. Alex keeps on making jokes about stuff and how we’re a cute couple and he is upset that I’m living here even though we have different rooms. But recently Ryan has been the biggest sweetheart to me and caring about me more than what my ex has We were in my room watching a movie and we started cuddling and then we kissed should I feel guilty?