Talk to Psychologist on Negative Thoughts

Hi 24/7 I'm thinking about my girl friend, she kinda like ignoring me and I’m so much depressed about her I’m having negative thoughts about her like , she is ignoring me , she isn’t love me , she have affair , she have no time for me , she’s is talking with someone else etc. I’m type 2 diabetes I’m so much depressed and I have left a option for my self ( suicide)