Confusing Saggitarius man

A saggitarius man works for the same company as me. He visits the building we began talking alot. He let me know about his personal circumstances how he has children a vile ex and he does not have much money left after he has paid out for everything which has caused him to go off work with stress. We always have a laugh together as well as chat about his personal life. We switched numbers as we become friends and he went off with stress again I realised he was quite lonely and told him if he needs to talk I am there to talk to if he ever needs to.

He went off work for 2 months with stress again whilst he was off I text him every now and then just to see if he was ok, we spoke once on the phone as he had alot to say about what was going on. He never texts me first so I am not sure if I am annoying or even if my effort is apprecaited.

He came back to work and had to visit my building when he saw me we spoke and he went all red we had a little laugh and then it felt a bit awkward so I said i'd speak to him soon and he went to the next building. He emailed me not long after he left just saying he was ok and he had to cut his phone to save money and is only using his work phone from now on. I am not sure if he wants to be friends or colleagues now. I don't know if I should ask him. He never gets in contact with me first apart from once he text me randomly at 2am just saying hello. Very random and the email to let me know he had only got his work number. Do I just ask him or is he like this as I have a social life and a partner so he thinks I am too busy to be his friend? I am not sure.

When he is at home he just listens to the radio, sits in the garden or visits his mom. Maybe he just likes been alone? I am unsure what to think about the friendship or even if he wants to be friends now.