@Montea
This man is using you as an ego boost and possibly as wank fodder. Next thing he will be telling you that his wife doesn’t understand him, they are not having sex , you are so mature for your age and would you like to go out for a drink but just as friends, honestly.
Even if he is 100% genuine and has no bad intentions, He should not be confiding any personal problems to a female colleague who is nearly half his age . If he is lonely and tired he needs to talk to his mates / sister / mother / a counsellor.
Stop texting him at all. Only talk to him at work about work matters. No one to one chats at all, for any reason . No gifts at all, not for the baby. No it’s not remotely nice, it’s weird and inappropriate.
You are 19 so you need to learn this life lesson now, so please listen well.
Life is full of creepy married blokes who love to chat up and perhaps shag young single women. STAY AWAY FROM THEM.
They don’t like you, they are not interested in helping you after your gran/ budgie died or supporting your career - they want sex.
Otherwise you will get used and perhaps get your heart broken. Your colleagues at work will spot the affair straight away - some will look down on you and other men will try it on as well. People will laugh at you behind your back. Some women might feel sorry for you, others will gossip about you.
You will damage your career and your self esteem.
And you will make it hard to form a decent equal relationship with a man your own age.
Just step away now.