I thought he had a Stroke? My ex has Gliobastoma, can I be sad?

I thought that my ex husband had a Stroke??…..on the morning of May 2nd my ex husband and his wife were sitting down to breakfast when he dropped his orange juice so he stood up and started stumbling when he was about to bend over to pick up his glass off the floor……he said that his legs were going numb so after about 30 minutes he decided to head on into work……so he made it to work and told his boss that both of his legs were going numb and he started slurring his words and by then he was feeling like his legs were completely numb and was unable to stand up…..so my son also works there and they had called him and told him about his dad so he went and got him and drove him home…..were my son told his step mom that he was complaining about both of his legs were numb and he was slurring his words,had some confusion about what happened and was confused about everything that was going on…..so my son told step mom that he was taking him to our home town hospital to the ER…..so they made it their and told the doctor everything so they tested him for a Stroke…..all test results came back and the doctor went in to his room and said…..”he didn’t have a Stroke “ instead they had found a Mass on the Brain……the doctor decided to transport him to another hospital…..so finally they found a hospital that was able to take him and around 10:30 that night he was transported to a hospital in the Woodlands to St.Lukes hospital…..my son drove his step mom to the hospital and when they arrived they had already taken him to his room in ICU…..the next morning early they were already taking him to have an MRI of the brain……they were able to see that the Mass was big and deep in the brain and they also were 99.9% sure that he had Gliobastoma Cancer of the brain……they were going to send him home that day but his heart started to act up and his blood pressure was ski high and that’s when they decided to go on and do a biopsy on Monday morning…..he was having trouble lifting his leg on the right side and he was slurring his words,his eye on the right side was bulging out,he was confused but everything that was going on and he was thinking that he was in Bryan/College Station instead of the Woodlands hospital….they decided to go on and do the biopsy on his brain to determine whether he was able to be operated on which he was NOT able to have surgery on it…..so after his biopsy they decided to send him home but they are suggesting Radiation Therapy and Chemotherapy with the pills……my 2 kids that I have with him and so upset and besides themselves that it’s just like they’re having a nightmare but they are not sleeping it’s real life…..both of our kids are coming to me especially my daughter and they are saying things that are upsetting them and what is the real life span of someone like what he has,just a lot of questions and thoughts they’re having…..it’s so hard for me to help them because even though he and I have been divorced for almost 30 years now and I was remarried to my my husband who passed away 5 years ago from Acute Myeloid Leukemia (a form of cancer)…..and now my ex husband has Gliobastoma(cancer of the brain)….. I have never wanted to have anything bad especially life threatening happen to him….but I just can’t stop crying over this and him having Gliobastoma….. I feel so much pain for him being so sick and he possibly could be gone from our world to see his home in Heaven….. I just can’t imagine my kids not having there dad around here anymore……but my question to everyone is (do I have the right to be feeling this way to where I’m crying over this for him……I have always felt that he is still apart of me because we have kids together….so I been crying a lot lately over him…..is this ok or am I being paranoid for a reason that I care but should not be worried or upset about this situation for him instead I should just be here for my kids and be able to help them get through whatever comes their way?