<human>: My ex and I broke up last month. Towards the end, his anxiety about graduating and his grandparents health made him not very social; of course I didn't know any of this until he told me a week after we broke up in his attempt to promise me the moon and get me back. 

Since then, I've been hanging out a lot with one guy recently. We've been seeing each other most of the week and go out, mostly spend our time watching movies and cuddling. 

I'm still in contact with my ex. For some reason, I can't tell him I've been seeing this other guy. Ex has directly asked me about my feelings for the guy but I can't tell him. I don't want to lose him.

He hurt me bad in the last month by neglecting to see me and I just don't feel it'll work now. But he's telling me he's changed and will be there for me. I'm really confused. 

What should I do?

Give me the gist of the text in a nutshell
<bot>: I broke up with ex, can't tell him I'm seeing some new guy for reasons unknown to me. Need someone to talk me through this