Anxiety issues. Help with my anxiety!

Hi Doc, I am facing anxiety issues, not able to focus on anything, not even on my work,not able to do anything not able to enjoy the things I used to like,it's like everything is about to finish It's becoz of my relationship as we are on verge of breakup just because we can't continue any more due to family reasons. I can't trust my partner these days as I am feeling everytime he is lying me about not talking to his ex but many a times i feel and suspect that he is lying and due to this i can't trusty partner anymore and this gives me more and more anxiety.i aint able to focus on my things. I am not able to prepare for my upcoming neet pg. I just feel helpless I kind of keep checking my partner and his ex last seen on what's app ,many a times i had found them talking and even their last seen similar.i am finding difficulty in trusting him but the problem is I am finding it difficult to leave him becoz i love him and won't be able to deal with breakup.what to do pls help with my anxiety