<human>: My boyfriend and I have been dating for about three months now. Things have been going really well until recently. We had wanted to date each other for a really long time before we got together, so once that did happen things moved pretty quickly. 
I know he has trust issues from previous girlfriends and that doesn't bother me much because I have always been honest with him and communicated what was going on with me. He has been saying a lot of things about how he wants to be with me forever and loves me, and will text me things about how much he loves me. 
Recently though, things seem to have changed. He started to take testosterone pills to help motivate him to work out, and his trust issues seem to have come to more of a head because of it. I love spending the night with him, either at his place or mine, and he told me that he would never ask me to sleep with him, and he only does it because he knows I like it. Last night before I left I told him I loved him and he just said "mmhm" and then said he would never believe me when I say it. We were texting afterwards and he said that he doesn't trust me at all and that the close I get to him the less he trusts me, because that's just how his mind works. This really hurts me because I love him and being with him makes me happier than I have been with anyone else. 
Am I over thinking this situation? What should I do?

Summarize the given text in a few sentences.
<bot>: Boyfriend has trust issues, relationship was great but has felt different recently. He said the closer I get the more he doesn't trust me, what should I do?