Ok firstly u can't orchestrate a falling in love process, it just happens. You cannot make urself fall in or out of love. But what u can control is making a commitment.
So b4 saying I love u sit down and talk.
1) Tell about ur life, ur past , ur EXes (if any). Ask him to come clean about himself.
2) Before dreaming about spending ur life with him, get freindly with his buddies, go for group outings. Have couples dates where u mingle and understand his circle. Usually the kind of friends u keep is a good indicator of the person u r.
3) See if he is comfortable with you meeting his sister, brother , cousins etc. Most of the time these people are more or less same age group and easy to hang out with.
4) I am not saying u ask personal questions, that would be intrusive and can lead to trust issues. I am saying observe, note use ur common sense. Listen to ur heart and brain.
5) Think if you are comfortable taking this guy to meet ur parents? Would they like him? If no what complaints do they have against him? Is it silly things like caste , money etc or serious things like character, career etc. Coz the latter can ruin ur marriage once honeymoon period is over.
Hope this helps