Would you still stay?

Conversation with my boyfriend earlier:

Him: How’s your day going?

Me: Not well…. I’m very upset and sad, I learned this afternoon my grandma is in the hospital, she’s very sick and was diagnosed with cancer.

Him: o damn

Him: did you get your tattoo this morning

Me: yes

Him: color?

Me: no

Me: if something’s happens to her…it’s going to be like losing a piece of myself, she’s my grandma..but she’s been more of a mom to me. I’m just beside myself with the news.

Him: Wait u talking about ur mom

Me: no? My grandma, she’s like a mom to me. I don’t know my real mom…..I told you this before

Him: O I'm sry hunny

Him: I thought u ment ur actual mother

Thing is he was active on messenger for hours and it just appeared he was talking to someone else. The vibe I felt was he was going in between conversations, as he would read every 5-8 mins then respond every 20-30 mins

Me: Is everything ok with you??

Him: ya? Y?

Me: Are you mad at me?

Him: why would I be???

Me: just checking

Him: ok

Anyways I just didn’t feel….support from him….in my tough time…I have supported him in his. This just felt different…like someone else was more important

I do know if I brought it up how I felt he will say oh so sorry you felt you were be ignored I’m not checking my phone all the time and how I made him feel he did something wrong

Should I stay in this relationship?