Idk if I'm depressed or what

Spike
So I'm happily married. Been married for nearly 3 years. Well the boyfriend I had before my husband came along just recently died back in the ending of November. Me and him had a awesome relationship at first...he even gave me a promise ring that year for Christmas. One day I had a dr appointed and I left in enough time to see him and still make it to my appointment...I'm not there 5 min and he keeps telling me that I need to go or I'll be late, so I stormed out. Long story short, he started doing drugs because of stress. We broke up a month later cause I didn't support that lifestyle. We stopped talking and then after me and my now husband got engaged, he messages me claiming he's seeing me places and that he misses me. Then after we got married he messaged again and said Jesus wasn't real (I'm a Christian). He died of a heroine and pill overdose...and I feel at fault. Not a day has went by that I haven't thought of him. Me and my husband did go to the funeral. Since then, I've heard he got into the hardcore stuff after he found out I got engaged, he knew when I got married and tried to get on his friends Facebook to see my wedding pictures, and apparently he still loved me and said he always would. I'm depressed and have no one to talk to period.