Relationship Anxiety!!! Help?

Me and my boyfriend have been together for 6 months. We’re both just turning 18. I can be very obsessive and anxious. I worry about various things way more than i should and our relationship has become probably the biggest one. He cheated on my 2 months in the relationship, sending dick pics to another girl from a different snap chat account. i decided to forgive him. but the trust issues amplified after all of that. now i am constantly worried he will leave me, & that me worrying about him leaving will make him more likely to, that i should just leave before i get hurt. our phone calls are getting cut shorter, he seems less sexually interested, which I don't know if it’s normal because we’re getting deeper into the relationship or what? but he’s also planning a weekend for my birthday for me so that must be a good thing? i’m so lost. i’m just in a state of worry, and fear and i feel like its making everything worse... anyone else have this problem? how did you/do you deal with it?
Relationship Anxiety!!! Help?
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