I think it's a bad idea and especially because you still talk of being in love with him. As far as you are aware, he is married....probably has kids now and you are in a relationship yourself. I suspect that you are wanting to contact him, not just to innocently catch up, but to see if there still may be anything there between you...it's treading on dangerous ground. He may be happy to hear from you, he may not.....and you are letting yourself for heartache, if he doesn't reply, or he doesn't want to know you after all this time.
I had an ex contact me after almost ten years. He'd been my 'first love' and we'd been engaged to be married at one time. He married soon after we split, so did I....then I moved away and didn't hear from him again, until as I said almost ten years later.
It was a total surprise to me, to have him contact me, because I didn't think I'd ever hear from him again. And I had mixed feelings about him contacting and was unsure whether to mail him back. But anyway, I'd seen no harm in it and because such a long time had passed...so I'd mailed him. Thing is, I was married....and he told me, that he was still very married also. After a few emails were exchanged, in which he'd asked how I was, how life was treating me, that he'd thought about me all this time and wanted me to know he still cared...etc,etc...I decided to end the communication when he'd suggested meeting. I was MARRIED so was he....
Ironically however and while I decided to do the decent thing......my own H walked out on me for another woman, some time later. So hey, if I'd known that was gonna happen, I might as well have gone along to meet the ex!! LOL
Aint heard from him since....the ex that is.